"For me, it’s how many useful things I create, whether songs, companies, articles, websites, or anything else. If I create something that’s not useful to others, it doesn’t count. But I’m also not interested in doing something useful unless it needs my creative input. How do you grade yourself? It’s important to know in advance, to make sure you’re staying focused on what’s honestly important to you, instead of doing what others think you should."
-- Derek Sivers