A career
became great only if you have a great talent and a lot of luck. You have to
have talent because, obviously, no one could ever become great without talent.
But even if you have talent, to acquire a great career you must have a very huge
talent or a lot of luck. Without luck is very hard to prove your real potential
simply because if you haven't the chance to prove what you can really do is
quite impossible for someone to "discover your talent". So, luck is very
important to get a great career.