唯一注定要失败的策略就是不冒风险。

时间是一条既向前流又向后流的河流。

心理过程是大自然解决生活问题的方式。

The essence of mathematics is not to make simple things complicated, but to make complicated things simple.

"Do not wait for leaders; do it alone, person to person."

The sky is the limit.

数学是过去与未来的对话。