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.

Nobody knows whether our personalities pass on to another existence or sphere, but if we can evolve an instrument so delicate to be manipulated by our personality as it survives in the next life such an instrument ought to record something.

Direct thought is not an attribute of feminity. In this, women are now centuries behind man.

I have better use for my brain than to poison it with alcohol. To put alcohol in the human brain is like putting sand in the bearings of an engine.

Nature made us - nature did it all - not the gods of the religions.

Each time you fail, you have eliminated another wrong option.

The three things that are most essential to achievement are common sense, hard work and stick-to-it-iv-ness... Unfortunately, many of life's failures are experienced by people who did not realize how close they were to success when they gave up. I have far more respect for the person with a single idea who gets there than for the person with a thousand ideas who does nothing.