我不需要理由去做我自己。
生活对我们任何人来说都不容易。但那又怎样？我们必须有毅力，最重要的是对自己有信心。我们必须相信我们在某方面是有天赋的，而且这个目标必须实现。
The ideas of economists and political philosophers， both when they are right and when they are wrong， are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men， who believe themselves to be quite exempt from any intellectual influence， are usually the slaves of some defunct economist.
数学的本质在于它的自由。