在危机时期，真正的领导力是通过行动而不是言语来衡量的。

Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.

Music has the power to heal, to inspire, and to bring people together.

材料有自己的智慧。

人类智力的发展都应该主要归功于欲望，而欲望能否被普遍满足要依靠智力的发展。