Time is a slippery thing: lose hold of it once, and its string might sail out of your hands forever.

数学的力量在于它的普遍性和超越文化界限的能力。

如果你一直做你一直在做的事，你将一直得到你一直得到的东西。

我不让任何人让我感到渺小。

The most necessary, the most important, the principal, the most essential thing for a musician is this: to know what he wants, what he can do, and what he ought to do.