Libertas §27

²⁷ In faith and in the teaching of morality, God Himself made the Church a partaker of His divine authority, and through His heavenly gift she cannot be deceived. She is therefore the greatest and most reliable teacher of mankind, and in her swells an inviolable right to teach them. Sustained by the truth received from her divine Founder, the Church has ever sought to fulfill holily the mission entrusted to her by God; unconquered by the difficulties on all sides surrounding her, she has never ceased to assert her liberty of teaching, and in this way the wretched superstition of paganism being dispelled, the wide world was renewed unto Christian wisdom. Now, reason itself clearly teaches that the truths of divine revelation and those of nature cannot really be opposed to one another, and that whatever is at variance with them must necessarily be false. Therefore, the divine teaching of the Church, so far from being an obstacle to the pursuit of learning and the progress of science, or in any way retarding the advance of civilization, in reality brings to them the sure guidance of shining light. And for the same reason it is of no small advantage for the perfecting of human liberty, since our Saviour Jesus Christ has said that by truth is man made free: "You shall know the truth, and the truth shall make you free."(9) Therefore, there is no reason why genuine liberty should grow indignant, or true science feel aggrieved, at having to bear the just and necessary restraint of laws by which, in the judgment of the Church and of reason itself, human teaching has to be controlled.