The monad, of which we shall speak here, is nothing but a simple substance which enters into compounds; simple, that is to say, without parts.

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.

There is nothing without reason.

There are two famous labyrinths where our reason very often goes astray. One concerns the great question of the free and the necessary, above all in the production and the origin of Evil. The other consists in the discussion of continuity, and of the indivisibles which appear to be the elements thereof, and where the consideration of the infinite must enter in.

Natural religion itself, seems to decay very much. Many will have human souls to be material: others make God himself a corporeal being.

Every substance is as a world apart, independent of everything else except God.

To love is to place happiness in the heart of another.