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.

SINCERITY. Use no hurtful deceit; think innocently and justly, and, if you speak, speak accordingly.

学习数学的最好方法就是去做数学。

成为一个艺术家就是要不断地质疑。