When you have exhausted all possibilities, remember this - you haven't.
I am 67, but I'm not too old to make a fresh start.
Show me a thoroughly satisfied man - and I will show you a failure.
I never did anything worth doing entirely by accident. . . Almost none of my inventions came about totally by accident. They were achieved by having trained myself to endure and tolerate hard work.
Success is based on imagination plus ambition and the will to work.
I believe that the science of chemistry alone almost proves the existence of an intelligent creator.