I am afraid of radium and polonium ... I don't want to monkey with them.

I start where the last man left off. What the mind of man can conceive and believe, the mind of a man can achieve.

I owe my success to the fact that I never had a clock in my workroom. Seventy-five of us worked twenty hours every day and slept only four hours - and thrived on it.

That is to say, under the old way any time we wish to add to the national wealth we are compelled to add to the national debt. Now, that is what Henry Ford wants to prevent. He thinks it is stupid, and so do I, that for the loan of $30,000,000 of their own money the people of the United States should be compelled to pay $66,000,000 - that is what it amounts to, with interest.

To do much clear thinking a person must arrange for regular periods of solitude when they can concentrate and indulge the imagination without distraction.

The money one gets for selling one's soul is always spent in deadening one's conscience, so the net gain at the end of a lifetime is no greater than if the diabolic bargain had not been struck.

Our greatest weakness lies in giving up.