For although the will cannot be inwardly moved by any creature, yet it can be moved inwardly by God.

There is nothing on this earth more to be prized than true friendship.

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.

A scrap of knowledge about sublime things is worth more than any amount about trivialities.

Rarely affirm, seldom deny, always distinguish.

Love must precede hatred, and nothing is hated save through being contrary to a suitable thing which is loved. And hence it is that every hatred is caused by love.

The existence of a prime mover- nothing can move itself; there must be a first mover. The first mover is called God.