All the efforts of the human mind cannot exhaust the essence of a single fly.

If... the motion of the earth were circular, it would be violent and contrary to nature, and could not be eternal, since ... nothing violent is eternal .... It follows, therefore, that the earth is not moved with a circular motion.

There would not be a perfect likeness of God in the universe if all things were of one grade of being.

Because of the diverse conditions of humans, it happens that some acts are virtuous to some people, as appropriate and suitable to them, while the same acts are immoral for others, as inappropriate to them.

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

Sorrow can be alleviated by good sleep, a bath and a glass of wine.

A man does not always choose what his guardian angel intends.