Now where there are no parts, there neither extension, nor shape, nor divisibility is possible. And these monads are the true atoms of nature and, in a word, the elements of things.

It is necessary to believe that the mixture of evil has produced the greatest possible good: otherwise the evil would not have been permitted.

It has long seemed ridiculous to me to suppose that the nature of things has been so poor and stingy that it provided souls only to such a trifling mass of bodies on our globe, like human bodies, when it could have given them to all, without interfering with its other ends.

Music is a secret and unconscious mathematical problem of the soul.

I hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration.

Music is a hidden arithmetic exercise of the soul, which does not know that it is counting.

Music is the pleasure the human mind experiences from counting without being aware that it is counting.