You are always a valuable, worthwhile human being — not because anybody says so, not because you're successful, not because you make a lot of money — but because you decide to believe it and for no other reason.

The meaning of a word is not a mental entity， but a social practice.

我喜欢探索可见与不可见之间的界限。

宇宙不仅比我们想象的更奇怪，它比我们能想象的还要奇怪。