To pretend angels do not exist because they are invisible is to believe we never sleep because we don't see ourselves sleeping.

It is a sin directly against one's neighbour, since one man cannot over-abound in external riches, without another man lacking them.

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

Three conditions are necessary for Penance: contrition, which is sorrow for sin, together with a purpose of amendment; confession of sins without any omission; and satisfaction by means of good works.

Wonder was the motive that led people to philosophy ... wonder is a kind of desire in knowledge. It is the cause of delight because it carries with it the hope of discovery.

Faith does not quench desire, but inflames it.

Prostitution in the towns is like the cesspool in the palace; take away the cesspool and the palace will become an unclean and evil smelling-place.