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

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

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

“If there is a God and future life, there is truth and good, and man's highest happiness consists in striving to attain them. We must live, we must love, and we must believe that we live not only today on this scrap of earth, but have lived and shall live”

“… for nightinggales - we know - can’t live on fairytales.”

“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.”