我必须研究政治和战争，以便我的儿子们可以自由地研究数学和哲学。

"I believe in the power of cinema to change the world."

The challenge of leadership is to be strong, but not rude; be kind, but not weak; be bold, but not bully; be thoughtful, but not lazy; be humble, but not timid; be proud, but not arrogant; have humor, but without folly.

文明的分布很大程度上是气候刺激的结果。