星星会褪色，太阳会因年老而变暗，自然会在岁月中沉沦；但你将在不朽的青春中繁荣。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。
No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.