The walls of a garden should be high enough to keep the world out, but low enough to let the sky in.

It is not true that people stop pursuing dreams because they grow old, they grow old because they stop pursuing dreams.

The power of causal reasoning is that it allows us to predict the effects of actions we have never taken.

A mathematician's work is mostly a solitary pursuit, but it is also deeply collaborative.

In business, you have to be willing to adapt or you will be left behind.

所有模型都是错误的，但有些是有用的。