Quality means doing it right when no one is looking.

成功的道路总是在建设中。

如果你愿意，我们可以回到那个山洞。

我只和自己竞争。

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.

数学是解开宇宙秘密和理解支配它的基本法则的关键。