Complete abstinence is easier than perfect moderation.

People are able to wonder at the height of mountains, and the huge waves of the sea, the vast compass of the ocean, at the circular motion of the stars, and then pass by themselves without wondering at all.

The good Christian should beware of mathematicians and all those who make empty prophecies. The danger already exists that mathematicians have made a covenant with the devil to darken the spirit and confine man in the bonds of Hell.

The key to immortality is first living a life worth remembering.

The mind commands the body and the body obeys. The mind commands itself and finds resistance.

The world is a book, and those who do not travel read only a page.

This is the very perfection of a man, to find out his own imperfections.

Thou hast commanded that an ill-regulated mind should be its own punishment.

Understanding is the reward of faith. Therefore seek not to understand that you may believe, but believe that you may understand.

We make a ladder for ourselves out of our vices when we trample them.