For example, Lewis’s 1947 book, Miracles, was penned before most Christians were aware of the emerging philosophy of naturalism. This is the belief that there is a naturalistic explanation for everything in the universe.
Naturalism undercuts any objective morality, opening the door to tyranny. In his book The Abolition of Man, Lewis warned that naturalism turns humans into objects to be controlled. It turns values into “mere natural phenomena”—which can be selected and inculcated into a passive population by powerful Conditioners. Lewis predicted a time when those who want to remold human nature “will be armed with the powers of an omnicompetent state and an irresistible scientific technique.” Sounds like the biotech debate today, doesn’t it?
Why was Lewis so uncannily prophetic? "
I love CS Lewis, I've read most if not all of his books, and have a collection of them prominently in my bookcases. But, I believe he did read Catholic documents regarding naturalism which perhaps he may have been made aware of by his good friend Tolkien, a Catholic, who convinced him of the existance of God and the need to not be atheistic.
here is some of my proof, check out the dates:
Encyclical of Pope Leo XIII 20 April 1884 http://ewtn.com/library/ENCYC/L13HUMAN.HTM
. For, from what We have above most clearly shown, that which is their ultimate purpose forces itself into view—namely, the utter overthrow of that whole religious and political order of the world which the Christian teaching has produced, and the substitution of a new state of things in accordance with their ideas, of which the foundations and laws shall be drawn from mere naturalism.
QUANTA CURA (Condemning Current Errors) Pope Pius IX Encyclical promulgated on 8 December 1864. http://ewtn.com/library/ENCYC/P9QUANTA.HTM For you well know, venerable brethren, that at this time men are found not a few who, applying to civil society the impious and absurd principle of "naturalism," as they call it, dare to teach that "the best constitution of public society and (also) civil progress altogether require that human society be conducted and governed without regard being had to religion any more than if it did not exist; or, at least, without any distinction being made between the true religion and false ones." And, against the doctrine of Scripture, of the Church, and of the Holy Fathers, they do not hesitate to assert that "that is the best condition of civil society, in which no duty is recognized, as attached to the civil power, of restraining by enacted penalties, offenders against the Catholic religion, except so far as public peace may require." From which totally false idea of social government they do not fear to foster that erroneous opinion, most fatal in its effects on the Catholic Church and the salvation of souls, called by Our Predecessor, Gregory XVI, an "insanity,"2 viz., that "liberty of conscience and worship is each man's personal right, which ought to be legally proclaimed and asserted in every rightly constituted society; and that a right resides in the citizens to an absolute liberty, which should be restrained by no authority whether ecclesiastical or civil, whereby they may be able openly and publicly to manifest and declare any of their ideas whatever, either by word of mouth, by the press, or in any other way." But, while they rashly affirm this, they do not think and consider that they are preaching "liberty of perdition;"3 and that "if human arguments are always allowed free room for discussion, there will never be wanting men who will dare to resist truth, and to trust in the flowing speech of human wisdom; whereas we know, from the very teaching of our Lord Jesus Christ, how carefully Christian faith and wisdom should avoid this most injurious babbling."4
THE SYLLABUS Pope Pius IX http://ewtn.com/library/PAPALDOC/P9SYLL.HTM
Condemned:
I. PANTHEISM, "NATURALISM" AND ABSOLUTE RATIONALISM
1. There exists no Supreme, all-wise, all-provident Divine Being, distinct from the universe, and God is identical with the nature of things, and is, therefore, subject to changes. In effect, God is produced in man and in the world, and all things are God and have the very substance of God, and God is one and the same thing with the world, and, therefore, spirit with matter, necessity with liberty, good with evil, justice with injustice.—Allocution "Maxima quidem," June 9, 1862.
2. All action of God upon man and the world is to be denied.—Ibid.
3. Human reason, without any reference whatsoever to God, is the sole arbiter of truth and falsehood, and of good and evil; it is law to itself, and suffices, by its natural force, to secure the welfare of men and of nations.—Ibid.
4. All the truths of religion proceed from the innate strength of human reason; hence reason is the ultimate standard by which man can and ought to arrive at the knowledge of all truths of every kind.—Ibid. and Encyclical "Qui pluribus," Nov. 9, 1846, etc.
5. Divine revelation is imperfect, and therefore subject to a continual and indefinite progress, corresponding with the advancement of human reason.—Ibid.
6. The faith of Christ is in opposition to human reason and divine revelation not only is not useful, but is even hurtful to the perfection of man.—Ibid.
7. The prophecies and miracles set forth and recorded in the Sacred Scriptures are the fiction of poets, and the mysteries of the Christian faith the result of philosophical investigations. In the books of the Old and the New Testament there are contained mythical inventions, and Jesus Christ is Himself a myth.
LIBERALISM IS A SIN 1886 Dr. Don Felix Sarda Y Salvany http://ewtn.com/library/THEOLOGY/LIBSIN.HTM
Liberalism is the program of naturalism. Free-thought begets free morals, or immorality. Restraint is thrown off and a free rein given to the passions. Whoever thinks what he pleases will do what he pleases. Liberalism in the intellectual order is license in the moral order. Disorder in the intellect begets disorder in the heart, and vice-versa. Thus does Liberalism propagate immorality, and immorality Liberalism." (Ch. 26).
It is true that modern naturalism does not so regard or understand the case. But the law of the Church in matters of morals and doctrines is unchangeable; it ordains today as it did yesterday, and heresy is always heresy, no matter what the shape it takes. Appearances may be fair, and the devil may present himself as an angel of light.
Piety itself does not escape the action of this pernicious naturalistic principle; it converts it into pietism—that is to say, into a parody of true piety, as is painfully seen in the pious practices of so many people who seek in their devotions only the sentimental emotions of which they themselves are able to be the source. They are devout over themselves, worshiping their own little sentiments and offering incense to idols graven after their own image. This is simply spiritual sensualism, and nothing else. Thus we see in our day in so many souls the degeneration of Christian asceticism (which is the purification of the heart by the repression of the appetites) and the falsification of Christian mysticism, which is neither emotion, nor interior consolation, nor any other epicurean foible of human sentiment, but union with God through a supernatural love for Him and through absolute submission to His holy will. Therefore it is that the Catholicity of a great number of people in our times is a Liberal Catholicity, or rather, a false Catholicity. It is really not Catholicity, but mere naturalism, a pure rationalism; it is in a word paganism disguised in Catholic forms and using Catholic language.
What then are the permanent causes of Liberalism?
1. Corruption of morals: The theater, literature, public and private morals are all saturated with obscenity and impurity. The result is inevitable; a corrupt generation necessarily begets a revolutionary generati .on. Liberalism is the program of naturalism. Free thought begets free morals, or immorality. Restraint is thrown off and a free rein given to the passions. WHOEVER THINKS WHAT HE PLEASES WILL DO WHAT HE PLEASES. Liberalism in the intellectual order is license in the moral order. Disorder in the intellect begets disorder in the heart, and vice-versa. Thus does Liberalism propagate immorality, and immorality Liberalism.
NATURALISM, THE DENIAL OF THE SUPERNATURAL, IT INCULCATES EVERYWHERE. To divorce the entire life of the people from her influence—by the institution of civil marriage, by civil burial and divorce, by teaching the insidious doctrine that society as such has no religious relations or obligations and that man as a social and civil being is absolutely independent of God and His Church and that religion is a mere private opinion to be entertained or not entertained, as one pleases such is the program, such is the effect, and such, in turn, is the cause of Liberalism.
When religion is divorced from the school, Liberalism becomes its paramour. Secularism is naturalism, the denial of the supernatural. When that denial is instilled into the soul of the child, the soil of the supernatural becomes sterilized. Liberalism has realized the terrific power of education and with satanic energy is now striving, the world over, for the possession of the child.