I definitely appreciate Cuban's words.

I think the truth is that one must question the sincerity of their passion if they're unwilling to put forth effort for it. For many, I think a passion is something they'd like people to think they do. If they're really passionate about it, they'll do something about it; at that point, there'd be no question.

I am guilty of that as well. When I am passionate it usually mean that I want to scratch an itch. But now I think that passion is something that comes after you put a lot of effort on the subject matter. BTW, I submitted Cuban's post to HN to challenge the notion of passion http://news.ycombinator.com/item?id=4680098

Exactly. I think you summed it up better than the original blog post.