It is
ordinary people who succeed, yes, but when they do ordinary things in an extra ordinary way.
But
is it possible to do something extra ordinarily unless one like what he does?
Edison obtained over thousand patents and many of them were class inventions. But could he have accomplished that much unless he liked experimenting, trying out new ideas? No. He liked very much what he did.
A salesman will become a super salesman only if he enjoys selling. There are other factors too. But without this basic quality he can never really succeed in his field.
Christian Bernard loved surgery and he could even dare to do heart transplantations. He would have studied every detail of operations and a lot of his thought would have been devoted for it. He simply loved what he did.
Murdock is a media baron. He enjoys his filed and Bill gates has produced the best computer soft wares and marketed it successfully. His work was and is his hobby.
.
For Viswaanathan Anand, the chess numero uno of the world, the game is his work, hobby and that which occupies his mind full time.
If you ant to succeed you have to like it like a hobby. You will not get tired if you work spend time in your hobby. You will love it. Chose a job/profession you can love and ensure your success.