Remember, if you ever need a helping hand, you'll find them at the end of each of your arms. As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.

Everyone has infinite potential.

That there are things in this world not carved out of gray stone. That there s a small place inside of us they can never lock away, and that place is called hope.

The price of freedom is eternal vigilance.

"Every man has his secret sorrows which the world knows not; and often times we call a man cold when he is only sad."

科学的进步依赖于挑战权威的勇气。