The following quote is taken from my friend Stephen Weber's Daily Encouragement devotional for today. Check out his site here.
A Bible teacher has observed "Contentment is understanding that if I am not satisfied with what I have, I will never be satisfied with what I want." Among the many ways the world seeks to force us into its mold is the lie that it can offer true satisfaction. Contentment is not the fulfillment of what you want, but the realization of how much you already have and finding satisfaction with that. It's realizing in the words from the great hymn that, "All I have needed Thy hand hath provided." Contentedness and thankfulness are interrelated.