He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.

The secret to success is constancy of purpose.

Life is either a daring adventure or nothing at all.

Me only have one ambition, y'know. I only have one thing I really like to see happen. I like to see mankind live together – black, white, Chinese, everyone – that's all.

I have always imagined that Paradise will be a kind of library.

The important thing is not to stop questioning.

Success is not about seeking constant praise; it's about finding fulfillment in the process and progress of your journey.