This might sound like one of the more pretentious of quotes, but there are a few things worth considering before making that judgement.
Passionate people are often called "obsessed" or "crazy". They do what they do because they love what they do. For them, happiness comes from doing the work, not from being able to relax afterwards.
Lazy people, or any mediocre people for that matter, fall into the habit of calling these passionate people "obsessed" or "crazy" as an excuse. This post is just a shout-out to the people who are passionate about their work. Keep on doing what you do, and don't let anyone discourage you to do what you love to do.