The key to building a successful business is to focus on creating value for your customers.

你不必被过去做过或没做过的事情定义。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

If you want to change the world, start by changing the way you think.

人生太重要，不能严肃地谈论它。