Every wrong attempt discarded is another step forward

Show me a thoroughly satisfied man - and I will show you a failure.

None of my inventions came by accident. I see a worthwhile need to be met and I make trial after trial until it comes. What it boils down to is one per cent inspiration and ninety-nine per cent perspiration.

My main purpose in life is to make money so I can afford to go on creating more inventions.

The great trouble is that the preachers get the children from six to seven years of age and then it is almost impossible to do anything with them.

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.

The greatest discoveries will be along spiritual lines. This is the field where miracles are going to happen. Spiritual power is the greatest underdeveloped power and has the greatest future.