Satisfaction lies in the effort, not in the attainment, full effort is full victory.

Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.

An investment in knowledge pays the best interest. 

Laughter is America's most important export.

You will find men who want to be carried on the shoulders of others, who think that the world owes them a living. They don't seem to see that we must all lift together and pull together. 

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.

As a man sow, shall he reap. and I know that talk is cheap. But the heat of the battle is as sweet as the victory.

I came across few whites as a boy at Qunu. The local magistrate, of course, was white, as was the nearest shopkeeper. Occasionally, white travelers or policemen passed through our area. These whites appeared as grand as gods to me, and I was aware that they were to be treated with a mixture of fear and respect.

The probability that we may fail in the struggle ought not to deter us from the support of a cause we believe to be just.

Be more dedicated to making solid achievements than in running after swift but synthetic happiness.

Do not overrate what you have received, nor envy others. He who envies others does not obtain peace of mind.

It's not the tools that you have faith in - tools are just tools. They work, or they don't work. It's people you have faith in or not. Yeah, sure, I'm still optimistic I mean, I get pessimistic sometimes but not for long.