The only thing I use my body for is to carry my brain around.

Invention is 1% inspiration and 99% perspiration

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

The biggest failure of man is that he gives up before he realizes how close he was to success.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

Let the public throw bouquets to the inventors and in time we will all be happy.

Oh these mathematicians make me tired! When you ask them to work out a sum they take a piece of paper, cover it with rows of A's, B's, and X's and Y's ... scatter a mess of flyspecks over them, and then give you an answer that's all wrong!