If you can do a half-assed job of anything, you're a one-eyed man in a kingdom of the blind. - Kurt Vonnegut
Don't do things half-assed. If a thing is worth doing at all, it's worth doing as well as you can possibly do it. Pick out something you think is worthwhile and do it or work at it with passion. Do it with all your might.
You don't like your job, you don't strike. You go in every day and do it really half-assed. That's the American way. - Matt Groening
I use a whole lot of half-assed semicolons; there was one of them just now; that was a semicolon after 'semicolons,' and another one after 'now. - Ursula K. Le Guin