Thomas Alva Edison

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

I am proud of the fact that I never invented weapons to kill.

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

There is no substitute for hard work.

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

To my mind the old masters are not art; their value is in their scarcity.

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

I never did anything by accident, nor did any of my inventions come by accident; they came by work.

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

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