A lot of people have asked this question. Here are a few of the answers:
John Carmack: Focused, hard work is the real key to success. Keep your eyes on the goal, and just keep taking the next step towards completing it. If you arent sure which way to do something, do it both ways and see which works better.
Morihei Ueshiba: Failure is the key to success; each mistake teaches us something.
Alexander Graham Bell: Before anything else, preparation is the key to success.
Monica Seles:Thats the key to success, isnt it? It has to be fun.
Julius Erving:The key to success is to keep growing in all areas of life - mental, emotional, spiritual, as well as physical.
Dan Millman: Willpower is the key to success. Successful people strive no matter what they feel by applying their will to overcome apathy, doubt or fear.
Donald Latumahina:The key to success is making yourself as useful as possible to others.
All of these are excellent ideas.And there are many more we could list. But there is one that is missing.One that enables and empowers all the other keys to success.