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

Mr. Edison worked endlessly on a problem, using the method of elimination. If a person asked him if he were discouraged because so many attempts proved unavailing, he would say, "No, I am not discouraged, because every wrong attempt discarded is another step forward.".

This problem, once solved, will be simple.

I am both pleased but astonished by the fact that mankind has not yet begun to use all the means and devices that are available for destruction. I hope that such weapons are never manufactured in quantity.

I am so deaf I am debarred from hearing all the time articulation and have to depend on the judgment of others.

Large portions of life's disappointments are individuals who did not understand that they were so near achievement when they surrendered.

I never pick up an item without thinking of how I might improve it. I never perfected an invention that I did not think about in terms of the service it might give others. I want to save and advance human life, not destroy it. I am proud of the fact that I never invented weapons to kill. The dove is my emblem.