A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.

The joy of discovery in mathematics is like solving a puzzle that the universe has left for us.

We are all shaped by the invisible hand of evolution.

Success is not about the money you make, it's about the difference you make in people's lives.

未经审视的生活不值得过。