Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

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.

I never did a day's work in my life, it was all fun.

We haven't failed. We now know a thousand things that won't work, so we are much closer to finding what will.

I believe in the existence of a Supreme Intelligence pervading the Universe.

The Bible of nature is the best damn Bible in the world. Its laws are perfect and grand, and all the prayers in the world can't change them. There is intelligence and law in this world, and there may be supreme intelligence and law, but so far as the religion of the day is concerned, it is all a damned fake.

Success is 90% perspiration and 10% inspiration!