The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
数学的本质不是使简单的事情复杂化，而是使复杂的事情简单化。
Trust is the currency of leadership.
No man is useless in this world who lightens the burden of someone else.
记忆是我们不断告诉自己我们的故事的方式——并且告诉别人一个稍微不同版本的故事。