One aspect of neighbourly love is that we must not merely will our neighbours good, but actually work to bring it about.
Thomas AquinasThe Study of philosophy is not that we may know what men have thought, but what the truth of things is.
Thomas AquinasMan can sin against nature in two ways. First, when he sins against his specific rational nature, acting contrary to reason. In this sense, we can say that every sin is a sin against man's nature, because it is against man's right reason.
Thomas Aquinas