Thomas A. Edison

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

Discontent is the first necessity of progress.

Maturity is often more absurd than youth and very frequently is most unjust to youth.

Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages.

Your worth consists in what you are and not in what you have.

Genius is one percent inspiration and ninety-nine percent perspiration.

The three great essentials to achieve anything worth while are: Hard work, Stick-to-itiveness, and Common sense.

If we did all the things we are capable of, we would literally astound ourselves.

There's a way to do it better — find it.

Being busy does not always mean real work. The object of all work is production or accomplishment and to either of these ends there must be forethought, system, planning, intelligence, and honest purpose, as well as perspiration. Seeming to do is not doing.

There is no substitute for hard work.

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

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

Just because something doesn't do what you planned it to do doesn't mean it's useless.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.