"The only thing we have to fear is fear itself."

The value of life lies not in the length of days，but in the use we make of them.

And those who were seen dancing were thought to be insane by those who could not hear the music.

Understanding the fundamentals is key to mastering any complex system.

当别人害怕时，你要贪婪，当别人贪婪时，你要害怕。