A great doctor kills more people than a great general.

The world is not a machine. Everything in it is force, life, thought.

I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is in fact in nature.

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.

I have said more than once, that I hold space to be something purely relative, as time; an order of coexistences, as time is an order of successions.

Justice is charity in accordance with wisdom.

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