Control the environment, not the behavior
He said it in the context of finding a PDA for himself that had email but no wireless access, and not having a particular brand of dark chocolate in the house. Reasons: he knows himself, and he knows he’d be breaking his own rules about email access and healthy diet.
That’s a powerful insight: engineer your environment to make undesired behavior inconvenient. I’ll be finding some ways of implementing that in my own life and work.