"Show me a thoroughly satisfied man and I will show you failure."

"I never perfected an invention that I did not think about in terms of the service it might give others. I find out what the world needs, then I proceed to try and invent it."

"Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages."

"Just because something doesn't do what you planned it to do doesn't mean it's useless."

"I owe my success to the fact that I never had a watch. I never knew what time it was, so I never stopped working."