The absence is often more powerful than the presence.

把握现在，把握此地，所有未来都通过此地冲入过去。

自然的简单性不应以我们概念的简单性来衡量。

I'm mentioning all this -- I'm mentioning all this because I think this is not merely a personal problem; you may think I'm wrong in this, but I think we live in an age when our lives are regularly punctuated by career crises, by moments when what we thought we knew -- about our lives, about our careers -- comes into contact with a threatening sort of reality.