Thomas A. Edison quotes
Many of life's failures are people who did not realize how close they were to success when they gave up. 
I have not failed. I've just found 10,000 ways that won't work. 
Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time. 
Five percent of the people think; ten percent of the people think they think; and the other eighty-five percent would rather die than think. 
We often miss opportunity because it's dressed in overalls and looks like work