But possibly I am something more than I suppose myself to be.

These long chains of perfectly simple and easy reasonings by means of which geometers are accustomed to carry out their most difficult demonstrations had led me to fancy that everything that can fall under human knowledge forms a similar sequence; and that so long as we avoid accepting as true what is not so, and always preserve the right order of deduction of one thing from another, there can be nothing too remote to be reached in the end, or to well hidden to be discovered.

Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.

Give me extension and motion and I will construct the universe.

There is a great difference between mind and body insomuch as body is by nature always divisible, and the mind is entirely indivisible.

Conquer yourself rather than the world.

An optimist may see a light where there is none, but why must the pessimist always run to blow it out?