I do gymnastics because I love it, not because I'm trying to be the best in the world.

A quota is just a number unless it’s enforced with conviction.

I don’t like to be quiet. I like to be loud.

Science without ethics is like a ship without a compass.

A proof tells us where to concentrate our doubts.

人尽皆知的真理是，一个财富殷实的单身汉，必定在寻找妻子。