真相很少是纯粹的，也从不简单。
"The truth is rarely pure and never simple."
求知若飢，虚心若愚。
The only real elegance is in the mind; if you've got that, the rest really comes from it.
The world is full of obvious things which nobody by any chance ever observes.
知识只有在它有助于人类解放时才有价值。