You must force yourself to consider opposing arguments.Especially when they challenge your best-loved ideas.

A writer is a person who is obsessed with language, with words, with the power of words to create worlds.

The ability to change constantly and effectively is made possible by high-level strategic planning.

在数学中，提出问题的艺术必须比解决问题更有价值。

过去半个世纪最重要的政治发展是自由民主在世界范围内的传播。