Nihil est sine ratione. There is nothing without a reason.

And there must be simple substances, because there are compounds; for the compound is nothing but a collection or aggregatum of simples.

The world is not a machine. Everything in it is force, life, thought.

Philosophy consists mostly of kicking up a lot of dust and then complaining that you can't see anything.

In whatever manner God created the world, it would always have been regular and in a certain general order. God, however, has chosen the most perfect, that is to say, the one which is at the same time the simplest in hypothesis and the richest in phenomena.

Virtue is the habit of acting according to wisdom.

Justice is charity in accordance with wisdom.