The worst of all deceptions is self-deception.

I had ambition not only to go farther than any man had been before, but as far as it was possible for a man to go.

Difficult circumstances serve as a textbook of life for people.

The health of the soil determines the health of the people.

布莱克-斯科尔斯公式的美妙之处在于它仅依赖于一个不可观测的参数，即股票的波动率。