Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
人们并不总是陪在我身边,但音乐永远在。
种树的最佳时间是20年前,其次是现在。
最好的领导者是那些倾听多于说话的人。
The only person you should try to be better than is the person you were yesterday.