I think veggie tales got it right with this one...a thankful heart is a happy heart. If I am busy thinking of things that I am thankful for I am much more content in the day. I am thankful that all of my needs are met.
1 Tim. 6: 9-10 Those who long to be rich, however, stumble into temptation and a trap and many senseless and harmful desires that plunge people into ruin and destruction. For the love of money is the root of all evils. Some people in reaching for it have strayed from the faith and stabbed themselves with many pains.