“We often miss opportunity because it's dressed in overalls and looks like work”

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

“Nature is what we know. We do not know the gods of religions. And nature is not kind, or merciful, or loving. If God made me the fabled God of the three qualities of which I spoke: mercy, kindness...”

“I have not failed. I've just found 10,000 ways that won't work.”

“Many of life's failures are people who did not realize how close they were to success when they gave up.”

“When you have exhausted all possibilities, remember this - you haven't.”

“Men of lofty genius when they are doing the least work are most active.”

“Neither a lofty degree of intelligence nor imagination nor both together go to the making of genius. Love, love, love, that is the soul of genius.”

“There's a fine line between genius and insanity. I have erased this line.”