要给儿童提供一个使他们得到满足的环境，必须努力了解儿童的需要。

It is the weak man who urges compromise--never the strong man.

The existence of the natural world is the same kind of fact as the existence of any proposition.

My art is a mirror of my mind.

It's not always necessary to be better than everyone else, but to be better than you used to be.

你能做的最好的投资就是投资自己。