没有人能在相当长的时间里，对自己戴一副面具，对大众戴另一副面具，而最终不困惑于哪一副才是真实的。
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.
当一扇门关闭时，你要知道，另一扇门正在打开。
What is the use of running when we are not on the right road?
In the realm of mathematics, every problem is an opportunity to discover something new.