I have not failed. I've just found 10,000 ways that won't work.
With every civil right there has to be a corresponding civil obligation.
If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found the object of his search... I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.
When you have exhausted all possibilities, remember this - you haven't.
The three great essentials to achieve anything worthwhile are, first, hard work; second, stick-to-itiveness; third, common sense.
Do you realize if it weren't for Edison we'd be watching TV by candlelight?
If we all did the things we are really capable of doing, we would literally astound ourselves.
Many of life's failures are people who did not realize how close they were to success when they gave up.