【译文】 孔子说：“我十五岁立志于学习，三十岁有所建树，四十岁不困惑，五十理解自然规律，六十明辨是非，七十随心所欲，不违规。”

Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: Ye must have faith.

You have to fight to reach your dream. You have to sacrifice and work hard for it.

Happiness is not something ready made. It comes from your own actions.

理论物理学之于数学，犹如雕塑之于几何学。