美国梦是由美国能源驱动的。

The history of all hitherto existing society is the history of class struggles.

生活的艺术在于知道何时坚持，何时放手。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

I'm drawn to characters who are at a crossroads.