后见之明对历史学家乃至回忆录作者非常有用，但遗憾的是，实践中的政治家却无法拥有。

I'm not perfect, but I strive for perfection.

The key to understanding life is to understand the interactions between its components.

量子力学的本质在于它迫使我们放弃经典的因果性理想。