Since the Catholic church accepts *trinity* on proof texts without the word actually appearing in Scripture, why do they have such a problem accepting *sola Scriptura* from proof texts as well without the word actually appearing in Scripture?
GOod point — so you agree that we Christians accept the term *trinity* on proof texts without the word actually appearing in Scripture, correct?
"And his gifts were that some should be apostles, some prophets, some evangelists, some pastors and teachers, to equip the saints for the work of ministry, for building up the body of Christ, until we all attain to the unity of the faith and of the knowledge of the Son of God, to mature manhood, to the measure of the stature of the fullness of Christ; so that we may no longer be children, tossed to and fro and carried about with every wind of doctrine, by the cunning of men, by their craftiness in deceitful wiles. Rather, speaking the truth in love, we are to grow up in every way into him who is the head, into Christ" (Eph. 4:1115).It is a circular reasoning which leaves the door open for rival interpretations of scripture to arise -- leading us even to theories of the Great Apostasy and other heresies.