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.

I don't say that bodies like flint, which are commonly called inanimate, have perceptions and appetition; rather they have something of that sort in them, as worms are in cheese.

I do not conceive of any reality at all as without genuine unity.

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

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

Every mind has a horizon in respect to its present intellectual capacity but not in respect to its future intellectual capacity.

It is unworthy of excellent men to lose hours like slaves in the labor of calculation which could be relegated to anyone else if machines were used.