You cannot always control what goes on outside. But you can always control what goes on inside.

我对那些在挣扎中、试图弄清楚某些事情的角色感兴趣。

The beauty of instrumental variables is that they allow us to see the world in a new light.

在数学中，你并不理解事物。你只是习惯了它们。

A clear mission gives direction and purpose to every action.

The soil remembers what we forget: respect it, and it will repay generations.