The only thing that overcomes hard luck is hard work.

The oldest， shortest words—'yes' and 'no'—are those which require the most thought.

Psychology must be a purely descriptive science.

在这个世界上生存的唯一方法是对它的恐怖麻木不仁。

The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.

忠于自己，但始终乐于学习。