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

But it is the knowledge of necessary and eternal truths which distinguishes us from mere animals, and gives us reason and the sciences, raising us to knowledge of ourselves and God. It is this in us which we call the rational soul or mind.

Music is nothing but unconscious arithmetic.

Nothing is more important than to see the sources of invention which are, in my opinion more interesting than the inventions themselves.

It is a good thing to proceed in order and to establish propositions. This is the way to gain ground and to progress with certainty.

We may say, that not only the soul (the mirror of an indestructible universe) is indestructible, but also the animal itself is, although its mechanism is frequently destroyed in parts.

The present is great with the future.