物理学的美丽在于它能够用几个简单的方程来描述宇宙。
有时候我们对一些事情感到难过，但我们不愿意告诉别人我们为此感到难过。
The most profound ideas in mathematics often arise from the simplest observations.
The historian must be a poet and a philosopher.
To live is to be open to the unexpected.