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

I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

Perfect numbers like perfect men are very rare.

The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.

I am indeed amazed when I consider how weak my mind is and how prone to error.

Each problem that I solved became a rule, which served afterwards to solve other problems.

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

It is not enough to have a good mind; the main thing is to use it well.

When it is not in our power to follow what is true, we ought to follow what is most probable.

Except our own thoughts, there is nothing absolutely in our power.

It is not enough to have a good mind; the main thing is to use it well.