Doesn't do any harm, that kind of stuff is usually uplifting for a short period of time just to make you pull your finger out a bit to get back on track.
You know that makes a lot of sense. Well summed up.
I've never really read any books, but as a sales person I've heard a ton of motivational speakers, some were crap, but most were at least useful in someway and give you a couple of nuggets to focus on over the next week or two to raise your game a little bit. None of it is rocket science, just a little positive boot up the arse that leaves you feeling good in the process.