Poor is the man whose pleasures depend on the permission of another.

不沉溺于过去，专注未来。

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

And when you’re down in the hole， when that moment comes， it’s really okay to feel bad for a little while. Give yourself time to mourn what you think you may have lost but then here’s the key， learn from every mistake because every experience， encounter， and particularly your mistakes are there to teach you and force you into being more who you are. And then figure out what is the next right move.

Mathematics is the foundation upon which all science is built.

"A person is, among all else, a material thing, easily torn and not easily mended."