The most challenging designs often lead to the most rewarding results.

任何实验的价值和效用都取决于材料是否适合其使用的目的。

幸福不是现成的东西。它来自你自己的行动。

宇宙不仅比我们想象的更奇怪，而且比我们能够想象的还要奇怪。

The true teacher defends his pupils against his own personal influence. He inspires self-distrust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.