The past is pregnant with the present.

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

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.

There is no way in which a simple substance could begin in the course of nature, since it cannot be formed by means of compounding.

Indeed every monad must be different from every other. For there are never in nature two beings, which are precisely alike, and in which it is not possible to find some difference which is internal, or based on some intrinsic quality.

I have said more than once, that I hold space to be something purely relative, as time; an order of coexistences, as time is an order of successions.

Music is nothing but unconscious arithmetic.