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