Show me a completely contented person and I'll show you a failure.

When there's no experimenting there's no progress. Stop experimenting and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble.

Opportunity is missed by most people because it is dressed in overalls and looks like work.

If I had not had so much ambition and not tried to do so many things, I probably would have been happier, but less useful.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.

Focus on how the end-user customers perceive the impact of your innovation - rather than on how you, the innovators, perceive it.

I believe that the science of chemistry alone almost proves the existence of an intelligent creator.