To be sane in a world of madmen is in itself madness.

One has to pay dearly for immortality；one has to die several times while still alive.

"Innovation is born from the intersection of curiosity and necessity."

True progress is measured not just in profits, but in the positive impact we have on people and the planet.

The course of history is the slow march of freedom.

The best thing about memories is making them.

Cheerfulness is the best promoter of health.

教授数学是为了激励下一代的思考者和问题解决者。