> If you want to play the violin beautifully, you have to practice for 10 years, there's no way around it.
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> If you want to do important things, you have to train in all sorts of capacities, and put in a lot of sweat.
I don't know the source of this, but I remember reading that most people who become good at things, by practicing for 10 years or whatever, were intrinsically motivated to do so. It's not a process of "want to be good -> force self to practice -> become good", but more of "want to practice -> become good". Can't remember if this was just conjecture, and I'm not a citeable source myself, but it seems like a more likely story. I know I've heard stories of talented people who got where they are because they spent all day noodling on the guitar, or writing programs, but I've heard less stories about people who didn't really enjoy the practice but forced themselves into it via willpower.
Not to say that "just noodling" is all that the person needed, or that no willpower was required, but that the process might be more intrinsic for the people who are actually going to become great anyway.