在数学中，提出问题的艺术必须比解决问题更有价值。

The essence of learning is the acquisition of meanings.

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.

和平是最高的善，因为它是心灵与其本性最完全一致的状态。

弦理论的数学美感表明它必须是自然界终极描述的一部分。