One of your tags is spelt wrong - it should of course be 'motivation'.
'Luck' is a tough one, isn't it? You get the lottery that you have zero control over (but a crucially important couple of people do) that is your creation. Then after that, it's mostly down to you (though a fair degree of randomness will forever be involved). And of course, hard work hardly needs to be restricted to physical endeavours, does it? If you really think your brainwaves through, you might just create something quite incredible. So mental work is arguably as important as any other type for most people, I'd say.
"Good luck."