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

The best thinking has been done in solitude. The worst has been done in turmoil.

One might think that the money value of an invention constitutes its reward to the man who loves his work. But... I continue to find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.

He's my friend that speaks well of me behind my back

The value of an idea lies in the using of it.

Opportunity is missed by most people because it comes dressed in overalls and looks like work.