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

The past is pregnant with the present.

We should like Nature to go no further; we should like it to be finite, like our mind; but this is to ignore the greatness and majesty of the Author of things.

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

Each portion of matter may be conceived of as a garden full of plants, and as a pond full of fishes. But each branch of the plant, each member of the animal, each drop of its humors, is also such a garden or such a pond.

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.

Nature does not make leaps.