Making something variable is easy. Controlling duration of constancy is the trick.

The only way to do great work is to love what you do.

"Every book should be a conversation between the author and the reader."

如果你想赢得诺贝尔奖，就不应该想着赢得诺贝尔奖。

土地不属于我们，我们只是从后代那里借来的。