Everything is self-evident.
Rene Descartes

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

I think; therefore I am.
Rene Descartes

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

Travelling is almost like talking with those of other centuries.
Rene Descartes

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

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

Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.
Rene Descartes