“All we can know is that we know nothing. And that's the height of human wisdom.”

“Nothing has been discovered, nothing has been invented. We can only know that we know nothing. And that's the highest degree of human wisdom.”

“We can know only that we know nothing. And that is the highest degree of human wisdom.”

“The only thing that we know is that we know nothing, and that is the highest flight of human wisdom.”

“Friends we shall never be, you know that yourself. Whether we shall be the happiest or the wretchedest of people--that's in your hands.”

“If we admit that human life can be ruled by reason, then all possibility of life is destroyed.”

“We are all created to be miserable, and that we all know it, and all invent means of deceiving each other. And when one sees the truth, what is one to do?”