To teach mathematics is to inspire the next generation of thinkers and problem solvers.
 对于每一个出现的表象,我们应该提出相等的表象。
The desire for recognition, the thymotic part of the soul, is what drives human history.
力量来自于克服那些你以为自己无法应对的事情。
The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and the other begins?
The best way to predict the future is to invent it.