Here's a half-hour conversation that will make you go hmmm …
Unless, I suppose you've already got all the self-control you need. But for me, I was intrigued by the findings that Roy Baumeister described in this interview by Joshua Knobe. Give it a shot -- this is not some vapid New Agey thing. It's a summary of a career's worth of experimental results.
[Added] Strengthening this point, here's what miceelf said in the discussion forum for this diavlog:
I haven't yet watched this but looking forward to it. Baumeister wrote the definitive takedown of the self-esteem movement.
If I find out where that lives, I'll add it here.
[Added2] Elsewhere in the same thread, once again from miceelf:
This is the usual reference. It's pretty accessible for lay people as well [...]
Here's his bio, which sums it up a little:
Two things to note. First, the titles below the video pane above are links to segments of the diavlog. The times in parentheses are the lengths of the segments. Use them to sample, if you're pressed for time or find something at the start less than riveting.
Second, if you've never listened to Josh before and you find yourself a bit put off by his manner of speaking, I'd say hang in there. That was my first reaction to him, too, long ago, but I easily got past it when I realized how many really smart questions he always puts forth.
Oh, and here's a link to Roy's new book, Willpower: Rediscovering the Greatest Human Strength.