Doubt is the origin of wisdom

Because reason...is the only thing that makes us men, and distinguishes us from the beasts, I would prefer to believe that it exists, in its entirety, in each of us.

A state is better governed which has few laws, and those laws strictly observed.

Bad books engender bad habits, but bad habits engender good books.

For to be possessed of a vigorous mind is not enough; the prime requisite is rightly to apply it.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

Even if I were to suppose that I was dreaming and whatever I saw or imagined was false, yet I could not deny that ideas were truly in my mind.