我们的教学方法只有一个，就是必须维持孩子们的高度兴趣和强烈持续的注意力。

The only limits that exist are the ones in your mind.

Mathematics is an art, and as an artist, you have to be honest with yourself.

成长是痛苦的，但没有什么比停滞不前更痛苦。

Our heroes are human heroes. That's a very new situation. Most other societies have had, right at their center, the worship of something transcendent: a god, a spirit, a natural force, the universe, whatever it is -- something else that is being worshiped. We've slightly lost the habit of doing that, which is, I think, why we're particularly drawn to nature.

我们把男人当成神，他们却离我们而去；有些把男人当成畜生，他们反倒摇尾乞悯，而且忠心耿耿。