Optimism is a learned skill.
乐观是一种可以学习的技能。
虚心和实腹的义理都很深奥，但首先要通过虚心才能认识本心。
I do not believe in God… to the extent that theists have made their concept intelligible， they have given us no reason to think anything answers to it.
The art of algorithm design is not just in solving problems, but in discovering new ways to think about them.
一个破坏其土壤的国家是在自我毁灭。