Think of what you do have instead of what you don't have. »

Pointing to hierarchy as a model of reference, the author says, we as human, got our hierarchy of needs mixed up keeping up with the Jones and the mass media and the advertisements’ effect that we often think things we don’t really need as a basic need, like having that Netbook for lounging away in the living room while watching the HBO on your big screen TV. What we do need to do, the author suggest that we actually do a self-analysis and gain a deep understanding of what we do need for the happiness which actually lasts.
I would add, an effortless exercise: when you encounter an advertisement walking along the road, a commercial while watching TV, or that stimulus that tell you that I want this! I want that!, when you see just another Jones, place that material, product or service into your own hierarchy of needs. Here be the spoilers:

Your life has incredible bounty and abundance. The desire you have for the material item of the moment is insignificant compared to the mountain of opportunity and abundance you have every second of every day. You already have so much – don’t overlook it out of a secondary desire for even more.