We must build a world in which there shall be no economic domination, no exploitation, no unemployment, and no war.

The game of life is the game of everlasting learning. At least it is if you want to win.

学校必须代表当下的生活——对孩子来说，这种生活与他在家庭、邻里或操场上所进行的生活一样真实和重要。

We must measure success not just in barrels produced, but in emissions avoided.

Anyone who isn't embarrassed of who they were last year probably isn't learning enough.

The rules of survival never change, whether you’re in a desert or in an downtown street: you need to be hydrated, you need food, and you need shelter.