当你怀疑自己是否能飞的那一刻，你就永远失去了飞翔的能力。
The moment you doubt whether you can fly, you cease for ever to be able to do it.
一段旋律可以永远陪伴你。
The world is a book, and those who do not read live only one life.
My kids are my greatest inspiration and my biggest motivation.
The most beautiful thing in mathematics is the simplicity of the ideas behind the complexity.
The simplest solutions are often the most elegant.