Surprises and reverses can serve as an incentive for great accomplishment. There are no rules here, we're just trying to accomplish something.

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

Most of my ideas belonged to other people who never bothered to develop them.

I think that Ingersoll had all the attributes of a perfect man, and, in my opinion, no finer personality ever existed. Judging from the past, I cannot help thinking that the intention of the Supreme Intelligence that rules the world is to ultimately make such a type of man universal.

Restlessness is discontent and discontent is the first necessity of progress. Show me a thoroughly satisfied man and I will show you a failure.

I think work is the world's greatest fun.

I cannot believe in the immortality of the soul. No, all this talk of an existence for us, as individuals, beyond the grave is wrong. It is born of our tenacity of life - our desire to go on living - our dread of coming to an end.