Life is most fulfilling when you live for Christ alone. You sense that you are fulfilling his wishes now and know that you'll be with him forever a little later. People normally try to fulfill themselves by doing what they like to do for themselves. And in many cases, they do accomplish something quite beautiful and satisfying. But without God, any fulfillment will be experienced only in this life. To live for Christ, you only need to do all things, whether big or little, for him. For example, when you take the garbage out, just humbly tell the Lord that you're doing it for him. Since you no longer do anything for your own sake, you'll feel a new freedom!