生命中最伟大的事情是保持心灵年轻。

Fearless is not the absence of fear. It’s not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death.

一个观念的效用决定了它在精神生活中的地位。