So why is this such a bad thing?
Let's say you tell yourself that once you get a promotion, so you can earn more money, you will finally be happy (it might not be so simple, but the idea is the same). What happens when you get that promotion? You're ecstatic! It is an amazing feeling and you feel happy. Then a day or two passes (or more maybe), and the excitement has worn off. You begin looking for the next thing that will bring you happiness, and so the circle continues. That's why we need to address this issue now, before it is so engrained in our mind that it is so much harder to change.