Nothing created has ever been able to fill the heart of man. God alone can fill it infinitely.

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

Art is right reason in the doing of work.

The principal act of courage is to endure and withstand dangers doggedly rather than to attack them.

It is necessary for the perfection of human society that there should be men who devote their lives to contemplation.

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.

Moral science is better occupied when treating of friendship than of justice.