The only thing that I know, is that I know nothing
A state is better governed which has few laws, and those laws strictly observed.
Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.
Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.
I think; therefore I am.
When I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream?