"The only true wisdom is in knowing you know nothing."

人们花在身体上的金钱和精力，如果用在心灵上，可能会带来更大的收益。

粒子的概念只是一个近似，在经典极限下有效。

幸福不是现成的，它来自于你自己的行动。

I would say that in the long run probably Communist China is likely to be in more of an expansionist phase than Soviet Russia...In their tactics, the Chinese Communists are probably the greater menace;

The best marketing strategy is a product so good it markets itself.