When the devil is called the god of this world, it is not because he made it, but because we serve him with our worldliness.

Arrive at knowledge over small streamlets, and do not plunge immediately into the ocean, since progress must go from the easier to the more difficult.

Pray thee, spare, thyself at times: for it becomes a wise man sometimes to relax the high pressure of his attention to work.

Faith does not quench desire, but inflames it.

The soul, which is the first principle of life, is not a body, but the act of a body; just as heat, which is the principle of calefaction, is not a body, but an act of a body.

It is only God who creates. Man merely rearranges.

God should not be called an individual substance, since the principle of individuation is matter.