Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

Quality should never be compromised, even when facing the toughest challenges.

The old believe everything; the middle-aged suspect everything; the young know everything.

记忆是不可靠的，它会随着时间改变和扭曲。

Mistakes can be corrected by those who pay attention to facts but dogmatism will not be corrected by those who are wedded to a vision.

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'