light bulb

What was Thomas Edison's actual quote relating to failure?

- I have not failed. I’ve just found 10,000 ways that won’t work.
- I have not failed 10,000 times. I have not failed once. I have succeeded in proving that those 10,000 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.
- I didn’t fail. I just found 2,000 ways not to make a lightbulb (I found 999 ways not to make a light bulb). I only needed to find one way to make it work.
- I didn’t fail 1,000 times. The light bulb was an invention with 1,000 steps.
- I have not failed, but found 1000 ways to not make a light bulb.
- I have not failed 700 times. I’ve succeeded in proving 700 ways how not to build a lightbulb.
- I never once failed at making a light bulb. I just found out 99 ways not to make one.