"You've got this project, and you're really excited so you write down a bunch of ideas to work on when you get home at 7.
So you get home at 7, you rush through dinner, you actually wind up worknig til 1, cause you wanted to get this thing working. Then it's the next morning and you feel like crap at work, and you have a drag of a day, and you get home and can't actually do the work you were planning to do at 7 cause now it's 8:30 and you're exhausted, and you don't wanna drink coffee cause then you'll be up til 2 again and it'll be worse than the night before. Tonight you'll just get a good night's sleep.
And you go to work the next day refreshed and think about the work you're gonna do on this project when you get home, but then it turns out your girlfriend says her mom is in town and you have to go out to dinner, so you can't do the work. Then you go to dinner and instead of talking with your girlfriend's mom you spend the whole dinner thinking about your project, and it just goes and goes.
This is the consequence of trying to do a million different things, but never really dedicating the right kind of time and committment on anything in particular--you suck at work, you suck at your social life, and now you suck at your project too. Congratulations."
-- Dan Benjamin, approximately, in B2W #23