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To touch is to remember.

Most men die at twenty or thirty; thereafter they are only reflections of themselves.

只要現在能夠停下來休息，那么就立刻停下來休息；如果要等到一切事情都辦妥時再停下來，那么這樣的時刻永遠也不可能等到。

There are tracts in my life that are bare and silent. They are the open spaces where my busy days had their light and air.

數學的美在于它允許我們從物理世界中抽象出來，專注于基本原理。