Mathematics is a game played according to certain simple rules with meaningless marks on paper.
A mathematical theory is not to be considered complete until you have made it so clear that you can explain it to the first man whom you meet on the street.
Physics is becoming too difficult for the physicists.
If I were to awaken after having slept for a thousand years, my first question would be: Has the Riemann hypothesis been proven?
If one were to bring ten of the wisest men in the world together and ask them what was the most stupid thing in existence, they would not be able to discover anything so stupid as astrology.