Church teaching may develop, but that does not mean it can change

In very recent weeks, a controversy has erupted in Catholic discussions following remarks attributed to Pope Leo XIV in an interview with Crux Now (also reported by LifeSiteNews). According to these reports, Pope Leo said:

“People want the Church doctrine to change, want attitudes to change. I think we have to change attitudes before we ever change doctrine.”

He also added that he finds it “highly unlikely, certainly in the near future, that the Church’s doctrine in terms of what the Church teaches about sexuality, what the Church teaches about marriage … will change.”

Some observers interpret these remarks as suggesting that once cultural or popular “attitudes” shift, doctrine might follow. Others insist the Pope was emphasizing pastoral sensitivity—that attitudes among the faithful must evolve (in understanding, charity, discipline) but that doctrine in its substance remains fixed.

This debate underscores a perennial question in Catholic life: What is doctrine? When and how can it legitimately develop? Is it ever changeable, or only the expression and application?

Introduction: An age of confusion

Our moment is marked by a restless call for “change” in every sphere, including religion. Many contemporary voices—even within the Church—speak as if immutable truths of faith could be revised to meet new social expectations. Yet the Catholic Church, entrusted with the deposit of faith by Christ Himself, insists with serene clarity: dogma and doctrine cannot change in their essence. This article draws on the perennial teaching of the Church, as articulated at the Council of Trent, reaffirmed in the Syllabus of Errors (1864), clarified by Saint John Henry Newman’s theory of the development of doctrine, and defended against the heresy of Modernism in Pascendi Dominici Gregis (1907). Together they witness to the same truth: the Church’s doctrinal definitions may develop in expression and depth, but they cannot mutate in substance.

I. Defining terms: dogma and doctrine

The Catholic theological tradition distinguishes dogma from doctrine, though the two are intimately related.

Dogma is a divinely revealed truth solemnly defined by the Church’s Magisterium as binding on all the faithful. Examples include the dogmas of the Trinity, the Incarnation, and the Immaculate Conception. Dogmas require the assent of faith (fides divina et catholica).

Doctrine, more broadly, is any authoritative teaching of the Church regarding faith and morals. Some doctrines are revealed (and thus dogmatic); others are authoritative applications of revealed truth, which nonetheless require religious submission of intellect and will (obsequium religiosum).

Both dogma and doctrine participate in the Church’s deposit of faith, the “faith once for all delivered to the saints” (Jude 1:3). They differ not in origin but in degree of formal definition and the type of assent required. Neither may be overturned without betraying Christ Himself, who is the Truth (John 14:6).

II. The Council of Trent: defining immutable faith

The Council of Trent (1545–1563) met during the Protestant Revolution to clarify and defend Catholic doctrine. Trent declared with unmistakable firmness that Divine Revelation is contained in both Sacred Scripture and Sacred Tradition and that the Church alone is the authentic interpreter of that Revelation.

In its Decree on Justification and other canons, Trent solemnly anathematized anyone who would reject or distort these truths. The Council declared:

“If anyone shall say that it is possible that at some time, given the progress of knowledge, a sense may be assigned to the dogmas propounded by the Church which is different from that which the Church has understood and understands: let him be anathema.”

This canon anticipates later debates about doctrinal development and firmly rejects any idea of essential change. Trent’s authoritative definitions remain binding, for they express truths revealed by God and entrusted to the Magisterium.

III. The Syllabus of Errors: Pius IX’s prophetic warning

Three centuries later, Blessed Pius IX confronted the rising tides of rationalism, liberalism, and indifferentism. His Syllabus of Errors (1864) enumerated and condemned propositions that undermined Catholic truth, including the claim that “Divine Revelation is imperfect, and therefore subject to a continuous and indefinite progress.”

This prophetic document insists that dogma does not evolve into something essentially different. While the Church’s understanding can grow in clarity and application, it cannot be altered to accommodate the spirit of the age. The Syllabus thus reinforces the unchanging character of Catholic teaching against pressures that continue to this day.

IV. John Henry Newman and authentic development

How, then, are we to understand the Church’s growing articulation of doctrine? Saint John Henry Newman’s seminal Essay on the Development of Christian Doctrine provides the classic Catholic answer. Newman distinguishes authentic development from corruption.

Authentic development occurs when the Church, guided by the Holy Spirit, draws out implicit truths or applies perennial principles to new circumstances. Examples include the explicit definitions of the Trinity at Nicaea or the dogma of the Immaculate Conception. These are not new revelations but organic growth, like an acorn becoming an oak.

By contrast, corruption occurs when the original meaning is contradicted or abandoned. Newman warns that to alter doctrine so that it no longer conveys the apostolic faith is not development but decay. His insight harmonizes with Trent and the Syllabus: the Church may deepen her understanding, but she cannot redefine truth.

V. Pius X and the condemnation of Modernism

Despite Newman’s careful distinction, the late nineteenth and early twentieth centuries saw the rise of Modernism, a movement claiming that all dogma must adapt to evolving human experience. Pope St. Pius X, in his 1907 encyclical Pascendi Dominici Gregis, denounced Modernism as “the synthesis of all heresies.”

Modernists argued that dogmas are mere symbols of religious feeling, inevitably changing as cultures change. Pius X rejected this outright:

In the same document, Pius X mandated the Oath against Modernism, requiring clergy and teachers to affirm that the meaning of dogmas remains “perpetually the same.” Far from stifling growth, this protected genuine development as Newman envisioned, while rejecting any mutation of substance.

VI. Unchanging truth and living tradition

Catholic tradition is living, not static. But “living” does not mean “mutable.” Rather, it is the life of the Holy Spirit who “will guide you into all truth” (John 16:13). The Magisterium, as servant of the Word of God, ensures that the faith is handed on “whole and entire” (cf. Dei Verbum 10).

This means that while explanations and pastoral approaches can and do adapt, the content of dogma and the core of doctrine are immutable. To claim otherwise is to imply that God deceives or that truth itself is relative—both blasphemous propositions.

Conclusion: Fidelity amid the tempest

The Catholic Church stands as a bulwark against the shifting sands of relativism. From Trent to Pius IX and Pius X, from Newman’s profound insights to the modern Magisterium, the constant teaching is clear: the substance of Catholic dogma and doctrine cannot change. What develops is our penetration of the mystery, our vocabulary, and our pastoral application—not the truth revealed by God.

In an era of doctrinal confusion, Catholics are summoned to deeper study, prayerful fidelity, and courageous witness. As St. Paul exhorted, “Guard the good deposit entrusted to you” (2 Tim 1:14). Only by holding fast to the unchanging faith can we hand on to future generations the treasure once delivered to the saints.

I know neither “sola scriptura”, nor “sola fides”, is in Scripture.

NIV Matthew 2:5
"In Bethlehem in Judea," they replied, "for this is what the prophet has written:

NIV Matthew 4:1-11
1. Then Jesus was led by the Spirit into the desert to be tempted by the devil.
2. After fasting forty days and forty nights, he was hungry.
3. The tempter came to him and said, "If you are the Son of God, tell these stones to become bread."
4. Jesus answered, "It is written: `Man does not live on bread alone, but on every word that comes from the mouth of God.' "
5. Then the devil took him to the holy city and had him stand on the highest point of the temple.
6. "If you are the Son of God," he said, "throw yourself down. For it is written: "`He will command his angels concerning you, and they will lift you up in their hands, so that you will not strike your foot against a stone.' "
7. Jesus answered him, "It is also written: `Do not put the Lord your God to the test.' "
8. Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their splendor.
9. "All this I will give you," he said, "if you will bow down and worship me."
10. Jesus said to him, "Away from me, Satan! For it is written: `Worship the Lord your God, and serve him only.' "
11. Then the devil left him, and angels came and attended him.

NIV Matthew 11:10
This is the one about whom it is written: "`I will send my messenger ahead of you, who will prepare your way before you.'

NIV Matthew 21:13
"It is written," he said to them, "`My house will be called a house of prayer,' but you are making it a `den of robbers.' "

NIV Matthew 26:24
The Son of Man will go just as it is written about him.

NIV Matthew 26:31
Then Jesus told them, "This very night you will all fall away on account of me, for it is written: "`I will strike the shepherd, and the sheep of the flock will be scattered.'

NIV Mark 7:6-7
6. He replied, "Isaiah was right when he prophesied about you hypocrites; as it is written: "`These people honor me with their lips, but their hearts are far from me.
7. They worship me in vain; their teachings are but rules taught by men.'

NIV Mark 9:11-13
11. And they asked him, "Why do the teachers of the law say that Elijah must come first?"
12. Jesus replied, "To be sure, Elijah does come first, and restores all things. Why then is it written that the Son of Man must suffer much and be rejected?
13. But I tell you, Elijah has come, and they have done to him everything they wished, just as it is written about him."

NIV Mark 11:17
And as he taught them, he said, "Is it not written: "`My house will be called a house of prayer for all nations' ? But you have made it `a den of robbers.' "

NIV Mark 14:27
"You will all fall away," Jesus told them, "for it is written: "`I will strike the shepherd, and the sheep will be scattered.'

NIV Luke 4:17-19
17. The scroll of the prophet Isaiah was handed to him. Unrolling it, he found the place where it is written:
18. "The Spirit of the Lord is on me, because he has anointed me to preach good news to the poor. He has sent me to proclaim freedom for the prisoners and recovery of sight for the blind, to release the oppressed,
19. to proclaim the year of the Lord's favor."

NIV Luke 7:27
This is the one about whom it is written: "`I will send my messenger ahead of you, who will prepare your way before you.'

NIV Luke 10:26
"What is written in the Law?" he replied. "How do you read it?"

NIV Luke 18:31-33
31. Jesus took the Twelve aside and told them, "We are going up to Jerusalem, and everything that is written by the prophets about the Son of Man will be fulfilled.
32. He will be handed over to the Gentiles. They will mock him, insult him, spit on him, flog him and kill him.
33. On the third day he will rise again."

NIV Luke 20:17-18
17. Jesus looked directly at them and asked, "Then what is the meaning of that which is written: "`The stone the builders rejected has become the capstone ' ?
18. Everyone who falls on that stone will be broken to pieces, but he on whom it falls will be crushed."

NIV Luke 21:22
For this is the time of punishment in fulfillment of all that has been written.

NIV Luke 22:37
It is written: `And he was numbered with the transgressors' ; and I tell you that this must be fulfilled in me. Yes, what is written about me is reaching its fulfillment."

NIV Luke 24:44-47
44. He said to them, "This is what I told you while I was still with you: Everything must be fulfilled that is written about me in the Law of Moses, the Prophets and the Psalms."
45. Then he opened their minds so they could understand the Scriptures.
46. He told them, "This is what is written: The Christ will suffer and rise from the dead on the third day,
47. and repentance and forgiveness of sins will be preached in his name to all nations, beginning at Jerusalem.

NIV John 2:17
His disciples remembered that it is written: "Zeal for your house will consume me."

NIV John 6:31
Our forefathers ate the manna in the desert; as it is written: `He gave them bread from heaven to eat.' "

NIV John 6:45
It is written in the Prophets: `They will all be taught by God.' Everyone who listens to the Father and learns from him comes to me.

NIV John 12:14-16
14. Jesus found a young donkey and sat upon it, as it is written,
15. "Do not be afraid, O Daughter of Zion; see, your king is coming, seated on a donkey's colt."
16. At first his disciples did not understand all this. Only after Jesus was glorified did they realize that these things had been written about him and that they had done these things to him.

NIV John 15:25
But this is to fulfill what is written in their Law: `They hated me without reason.'

NIV John 20:30-31
30. Jesus did many other miraculous signs in the presence of his disciples, which are not recorded in this book.
31. But these are written that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name.

NIV Acts 1:20
"For," said Peter, "it is written in the book of Psalms, "`May his place be deserted; let there be no one to dwell in it,' and, "`May another take his place of leadership.'

NIV Acts 7:42
But God turned away and gave them over to the worship of the heavenly bodies. This agrees with what is written in the book of the prophets: "`Did you bring me sacrifices and offerings forty years in the desert, O house of Israel?

NIV Acts 13:29
When they had carried out all that was written about him, they took him down from the tree and laid him in a tomb.

NIV Acts 13:32-33
32. "We tell you the good news: What God promised our fathers
33. he has fulfilled for us, their children, by raising up Jesus. As it is written in the second Psalm: "`You are my Son; today I have become your Father. '

NIV Acts 15:15-18
15. The words of the prophets are in agreement with this, as it is written:
16. "`After this I will return and rebuild David's fallen tent. Its ruins I will rebuild, and I will restore it,
17. that the remnant of men may seek the Lord, and all the Gentiles who bear my name, says the Lord, who does these things'
18. that have been known for ages.

NIV Acts 23:5
Paul replied, "Brothers, I did not realize that he was the high priest; for it is written: `Do not speak evil about the ruler of your people.' "

NIV Acts 24:14
However, I admit that I worship the God of our fathers as a follower of the Way, which they call a sect. I believe everything that agrees with the Law and that is written in the Prophets,
and I have the same hope in God as these men, that there will be a resurrection of both the righteous and the wicked.

NIV Romans 1:17
For in the gospel a righteousness from God is revealed, a righteousness that is by faith from first to last, just as it is written: "The righteous will live by faith."

NIV Romans 2:24
As it is written: "God's name is blasphemed among the Gentiles because of you."

NIV Romans 3:4
Not at all! Let God be true, and every man a liar. As it is written: "So that you may be proved right when you speak and prevail when you judge."

NIV Romans 3:10-12
10. As it is written: "There is no one righteous, not even one;
11. there is no one who understands, no one who seeks God.
12. All have turned away, they have together become worthless; there is no one who does good, not even one."

NIV Romans 4:17
As it is written: "I have made you a father of many nations." He is our father in the sight of God, in whom he believed--the God who gives life to the dead and calls things that are not as though they were.

NIV Romans 4:23-24
23. The words "it was credited to him" were written not for him alone,
24. but also for us, to whom God will credit righteousness--for us who believe in him who raised Jesus our Lord from the dead.

NIV Romans 8:36
As it is written: "For your sake we face death all day long; we are considered as sheep to be slaughtered."

NIV Romans 9:13
Just as it is written: "Jacob I loved, but Esau I hated."

NIV Romans 9:33
As it is written: "See, I lay in Zion a stone that causes men to stumble and a rock that makes them fall, and the one who trusts in him will never be put to shame."

NIV Romans 10:15
And how can they preach unless they are sent? As it is written, "How beautiful are the feet of those who bring good news!"

NIV Romans 11:7-10
7. What then? What Israel sought so earnestly it did not obtain, but the elect did. The others were hardened,
8. as it is written: "God gave them a spirit of stupor, eyes so that they could not see and ears so that they could not hear, to this very day."
9. And David says: "May their table become a snare and a trap, a stumbling block and a retribution for them.
10. May their eyes be darkened so they cannot see, and their backs be bent forever."

NIV Romans 11:26-27
26. And so all Israel will be saved, as it is written: "The deliverer will come from Zion; he will turn godlessness away from Jacob.
27. And this is my covenant with them when I take away their sins."

NIV Romans 12:19
Do not take revenge, my friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord.

NIV Romans 14:11
It is written: "`As surely as I live,' says the Lord, `every knee will bow before me; every tongue will confess to God.'"

NIV Romans 15:3-4
3. For even Christ did not please himself but, as it is written: "The insults of those who insult you have fallen on me."
4. For everything that was written in the past was written to teach us, so that through endurance and the encouragement of the Scriptures we might have hope.

NIV Romans 15:7-12
7. Accept one another, then, just as Christ accepted you, in order to bring praise to God.
8. For I tell you that Christ has become a servant of the Jews on behalf of God's truth, to confirm the promises made to the patriarchs
9. so that the Gentiles may glorify God for his mercy, as it is written: "Therefore I will praise you among the Gentiles; I will sing hymns to your name."
10. Again, it says, "Rejoice, O Gentiles, with his people."
11. And again, "Praise the Lord, all you Gentiles, and sing praises to him, all you peoples."
12. And again, Isaiah says, "The Root of Jesse will spring up, one who will arise to rule over the nations; the Gentiles will hope in him."

NIV Romans 15:21
Rather, as it is written: "Those who were not told about him will see, and those who have not heard will understand."

NIV 1 Corinthians 1:19
For it is written: "I will destroy the wisdom of the wise; the intelligence of the intelligent I will frustrate."

NIV 1 Corinthians 1:31
Therefore, as it is written: "Let him who boasts boast in the Lord."

NIV 1 Corinthians 2:9
However, as it is written: "No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him" --

NIV 1 Corinthians 3:19-20
19. For the wisdom of this world is foolishness in God's sight. As it is written: "He catches the wise in their craftiness" ;
20. and again, "The Lord knows that the thoughts of the wise are futile."

NIV 1 Corinthians 4:6
Now, brothers, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, "Do not go beyond what is written." Then you will not take pride in one man over against another.

NIV 1 Corinthians 9:9
For it is written in the Law of Moses: "Do not muzzle an ox while it is treading out the grain." Is it about oxen that God is concerned?

NIV 1 Corinthians 10:7
Do not be idolaters, as some of them were; as it is written: "The people sat down to eat and drink and got up to indulge in pagan revelry."

NIV 1 Corinthians 10:11
These things happened to them as examples and were written down as warnings for us, on whom the fulfillment of the ages has come.

NIV 1 Corinthians 14:21
In the Law it is written: "Through men of strange tongues and through the lips of foreigners I will speak to this people, but even then they will not listen to me," says the Lord.

NIV 1 Corinthians 15:45
So it is written: "The first man Adam became a living being" ; the last Adam, a life-giving spirit.

NIV 1 Corinthians 15:54
When the perishable has been clothed with the imperishable, and the mortal with immortality, then the saying that is written will come true: "Death has been swallowed up in victory."

NIV 2 Corinthians 4:13-14
13. it is written: "I believed; therefore I have spoken." With that same spirit of faith we also believe and therefore speak,
14. because we know that the one who raised the Lord Jesus from the dead will also raise us with Jesus and present us with you in his presence.

NIV 2 Corinthians 8:15
as it is written: "He who gathered much did not have too much, and he who gathered little did not have too little."

NIV Galatians 3:10
All who rely on observing the law are under a curse, for it is written: "Cursed is everyone who does not continue to do everything written in the Book of the Law."

NIV Galatians 3:13
Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: "Cursed is everyone who is hung on a tree."

NIV Galatians 4:22
For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.

NIV Galatians 4:27
For it is written: "Be glad, O barren woman, who bears no children; break forth and cry aloud, you who have no labor pains; because more are the children of the desolate woman than of her who has a husband."

NIV Hebrews 10:7
Then I said, `Here I am-- it is written about me in the scroll-- I have come to do your will, O God.'"

NIV 1 Peter 1:15-16
But just as he who called you is holy, so be holy in all you do; for it is written: "Be holy, because I am holy."

And now; for the Believers in Christ who may have wondered how much FAITH to place upon the Apostles written words...

NIV Luke 1:1-4
1. Many have undertaken to draw up an account of the things that have been fulfilled among us,
2. just as they were handed down to us by those who from the first were eyewitnesses and servants of the word.
3. Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you, most excellent Theophilus,
4. so that you may know the certainty of the things you have been taught.

NIV 2 Corinthians 1:13-14
13. For we do not write you anything you cannot read or understand. And I hope that,
14. as you have understood us in part, you will come to understand fully that you can boast of us just as we will boast of you in the day of the Lord Jesus.

NIV 2 Peter 3:16
He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.

NIV 1 John 2:12-14
12. I write to you, dear children, because your sins have been forgiven on account of his name.
13. I write to you, fathers, because you have known him who is from the beginning. I write to you young men, because you have overcome the evil one. I write to you, dear children, because you have known the Father.
14. I write to you, fathers, because you have known him who is from the beginning. I write to you, young men, because you are strong, and the word of God lives in you, and you have overcome the evil one.

The bottom line:

1 Corinthians 4:6

Catholic Translations

Douay-Rheims Bible
But these things, brethren, I have in a figure transferred to myself and to Apollo, for your sakes; that in us you may learn, that one be not puffed up against the other for another, above that which is written.

Catholic Public Domain Version
And so, brothers, I have presented these things in myself and in Apollo, for your sakes, so that you may learn, through us, that no one should be inflated against one person and for another, not beyond what has been written.

New American Bible
I have applied these things to myself and Apollos for your benefit, brothers, so that you may learn from us not to go beyond what is written, so that none of you will be inflated with pride in favor of one person over against another.

New Revised Standard Version
I have applied all this to Apollos and myself for your benefit, brothers and sisters, so that you may learn through us the meaning of the saying, “Nothing beyond what is written,” so that none of you will be puffed up in favor of one against another.

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.