The meaning of what is said is according to the motive for saying it: because things are not subject to speech, but speech to things. Therefore we should take account of the motive of the lawgiver, rather than of his very words.
Thomas AquinasFar graver is it to corrupt the faith that is the life of the soul than to counterfeit the money that sustains temporal life.
Thomas AquinasSecondly, man sins against nature when he goes against his generic nature, that is to say, his animal nature. Now, it is evident that, in accord with natural order, the union of the sexes among animals is ordered towards conception. From this it follows that every sexual intercourse that cannot lead to conception is opposed to man's animal nature.
Thomas AquinasHe who is drawn to something desirable does not desire to have it as a thought but as a thing.
Thomas AquinasSince faith rests upon infallible truth, and since the contrary of a truth can never be demonstrated, it is clear that the arguments brought against faith cannot be demonstrations, but are difficulties that can be answered.
Thomas AquinasIt must be understood that prime matter, and form as well, is neither generated nor corrupted, because every generation is from something to something. Now that from which generation proceeds is matter, and that to which it proceeds is form. So that, if matter or form were generated, there would be a matter for matter and a form for form, endlessly. Whence, there is generation only of the composite, properly speaking.
Thomas Aquinas