水，涌出，自然地流淌；至人的德行，不需着意修炼，万物自会随附。就像天自然高，地自然厚，日月自然明，何需修行！
最好的技术是无形的，它只是默默地发挥作用。
The more determinedly I exist, as myself, within the conditions of the time, the more clearly I shall hear the language of the past, the nearer I shall feel the breath of the centuries.
The most exciting moments in mathematics are when you realize that two seemingly unrelated areas are deeply connected.