In the story of the Ten Lepers (Luke 17:11-19) it is told that only one of the Lepers came back to thank Jesus for being healed. Christ doesn't say that the others are bad for not returning but he does commend the one who come back to give thanks. On a large scale, like how Christ healed all ten, God has already blessed the world. How do we respond? The returning Leper does five things that we especially associate with contemporary worship - he saw what had been done for him / Came to the Lord / praised Jesus with a loud voice / fell on his face infront of Christ / and thanked him. What if the tenth Leper had gone through the motions of the first four actions and never got around to actually saying thank you? He might as well not have come back at all.
Thanksgiving is a paradigm shift. It is saying that nothing else compares to the gift of Christ and that I am complete in that gift alone. Thankfulness is the pinnacle of losing my self - losing my life, goals, plans, dreams and placing them in the hands of God and giving thanks for where I am.
As it turns out worship is a bit harder than I first thought. But the reward of worship and the gift of thanksgiving are new eyes and a new heart in which to see and love myself, God and the world.