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

Nature is what we know. We do not know the gods of religions. And nature is not kind, or merciful, or loving. If God made me - the fabled God of the three qualities of which I spoke: mercy, kindness, love - He also made the fish I catch and eat. And where do His mercy, kindness, and love for that fish come in? No; nature made us - nature did it all - not the gods of the religions.

Two per cent. is genius, and ninety-eight per cent. is hard work.

I would construct and work along various lines until I found them untenable. When one theory was discarded, I developed another at once. I realized very early that this was the only possible way for me to work out all the problems.

Good fortune is what happens when opportunity meets with planning.

Everything comes to him who hustles while he waits.

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