城市的穷人就像树的根；看不见，但对它的生命至关重要。
"The city’s poor are like the roots of a tree; unseen, but essential to its life."
A writer's duty is to illuminate the shadows of the human soul.
"The best way to lead is to be vulnerable."
"The past is a foreign country; they do things differently there."
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
学习的意愿是一种内在动机，其来源和奖励都在于其自身的实践。
Our wisdom comes from our experience， and our experience comes from our foolishness.