The most important things are hardest to tell,because words shrink their importance.It's not easy to let strangers care about the good things in your life.

The desires， and other passions of man， in themselves， are in his own power； his real difficulties are， to know when they are to be controlled， and when not.

宇宙是不对称的，我相信我们所知道的生命是宇宙不对称性的直接结果。

I never look back. I look forward to the next challenge.