I hope I don't sound like a prig, but this is what I tell myself when the scale doesn't move (ahem) "You are not on a diet. You are adapting to a new way of eating. This isn't a race. Before, you wanted to lose weight as quickly as possible so you could go back to eating like a normal person. Now, you will be eating this way for the rest of your life. So relax, the pounds are bound to come off. Meanwhile, the inches are disappearing, and you feel great."
Of course, sometimes I just tell myself to shut up, because it can be very frustrating.