Italian Dominican friar, philosopher, Catholic priest, and Doctor of the Church (1225–1274)
Saint Thomas Aquinas (c. 1225 – 7 March 1274) was an Italian Dominican friar, philosopher, Catholic priest, and Doctor of the Church. An immensely influential philosopher, theologian, and jurist in the tradition of scholasticism, he is also known within the latter as the Doctor Angelicus, the Doctor Communis, and the Doctor Universalis. The name Aquinas identifies his ancestral origins in the county of Aquino in present-day Lazio, Italy. Among other things, he was a prominent proponent of natural theology and the father of a school of thought (encompassing both theology and philosophy) known as Thomism. He argued that God is the source of both the light of natural reason and the light of faith. His influence on Western thought is considerable, and much of modern philosophy is derived from his ideas, particularly in the areas of ethics, natural law, metaphysics, and political theory.
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Even though the natural light of the human mind is inadequate to make known what is revealed by faith, nevertheless what is divinely taught to us by faith cannot be contrary to what we are endowed with by nature. One or the other would have to be false, and since we have both of them from God, he would be the cause of our error, which is impossible.
Natural inclinations are present in things from God, who moves all things. So it is impossible for the natural inclinations of a species to be toward evil in itself. But there is in all perfect animals a natural inclination toward carnal union. Therefore it is impossible for carnal union to be evil in itself.
Give us, O Lord, a steadfast heart, which no unworthy affection may drag downwards; give us an unconquered heart, which no tribulation can wear out; give us an upright heart, which no unworthy purpose may tempt aside. Bestow upon us also, O Lord our God, understanding to know you, diligence to seek you, wisdom to find you, and a faithfulness that may finally embrace you; through Jesus Christ our Lord.
Being taken simply, as including all perfection of being, surpasses life and all that follows it; for thus being itself includes all these. And in this sense Dionysius speaks. But if we consider being itself as participated in this or that thing, which does not possess the whole perfection of being, but has imperfect being, such as the being of any creature; then it is evident that being itself together with an additional perfection is more excellent. Hence in the same passage Dionysius says that things that live are better than things that exist, and intelligent better than living things. Reply Obj. 3: Since the end corresponds to the beginning; this argument proves that the last end is the first beginning of being, in Whom every perfection of being is: Whose likeness, according to their proportion, some desire as to being only, some as to living being, some as to being which is living, intelligent and happy. And this belongs to few.