For those with faith, no evidence is necessary; for those without it, no evidence will suffice.

Man 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.

God himself would not permit evil in this world if good did not come of it for the benefit and harmony of the universe.

If forgers and malefactors are put to death by the secular power, there is much more reason for excommunicating and even putting to death one convicted of heresy.

If the highest aim of a captain were to preserve his ship, he would keep it in port forever.

Do not wish to jump immediately from the streams to the sea, because one has to go through easier things to the more difficult.

Without doubt one is allowed to resist against the unjust aggressor to one's life, one's goods or one's physical integrity; sometimes, even 'til the aggressor's death... In fact, this act is aimed at preserving one's life or one's goods and to make the aggressor powerless. Thus, it is a good act, which is the right of the victim.