"True strength is not in never falling, but in rising every time we fall."

Fear bound your heart and hope to release your heart.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

The only thing that scares me more than space aliens is the idea that there aren't any space aliens. We can't be the best that creation has to offer. I pray we're not all there is. If so, we're in big trouble.

The only limit to our realization of tomorrow will be our doubts of today.

要养活世界，我们必须首先学会尊重地球的极限。