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

Music is nothing but unconscious arithmetic.

It's easier to be original and foolish than original and wise.

Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

Now this connection or adaption of all created things with each, and of each with all the rest, means that each simple substance has relations which express all the others, and that consequently it is a perpetual living mirror of the universe.

Nothing is accomplished all at once, and it is one of my great maxims, and one of the most completely verified, that Nature makes no leaps: a maxim which I have called the law of continuity.

If you have a clear idea of a soul, you will have a clear idea of a form; for it is of the same genus, though a different species.