Summa Quotes

“It was necessary for man's salvation that there should be a knowledge revealed by God besides philosophical science built up by human reason ... because man is directed to God as to an end that surpasses the grasp of his reason: "The eye has not seen, O God...what things Thou hast prepared for them that wait for Thee" (Is 66:4). But the end must first be known by men who are to direct their ... actions to the end. Hence it was necessary for the salvation of man that certain truths about God which exceed human reason should be made known to him by divine revelation. Even as regards those truths about God which human reason could have discovered, it was necessary that man should be taught by a divine revelation; because the truth about God such as reason could discover would only be known by a few, and that after a long time, and with the admixture of many errors. Whereas man's whole salvation, which is in God, depends upon the knowledge of this truth. Therefore, in order that the salvation of men might be brought about more fitly and more surely, it was necessary that they should be taught divine truths by divine revelation.”
― Thomas Aquinas, Summa Theologica