好弓难以拉开，然而可以射得高射得深；良马难以驾御，然而可以负重行远。

To write a good love letter， you ought to begin without knowing what you mean to say， and to finish without knowing what you have written.

"In the middle of difficulty lies opportunity."

人类心智是一套信息处理机制，这些机制由自然选择设计来解决我们狩猎采集祖先面临的适应性问题。