There are also two kinds of truths: truth of reasoning and truths of fact.

I also readily admit that there are animals, taken in the ordinary sense, that are incomparably larger than those we know of, and I have sometimes said in jest that there might be a system like ours which is the pocketwatch of some enormous giant.

Thus God alone is the primary Unity, or original simple substance, from which all monads, created and derived, are produced.

There is nothing without reason.

It is worth noting that the notation facilitates discovery. This, in a most wonderful way, reduces the mind's labour.

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.

The present is saturated with the past and pregnant with the future.