Think about the things you do out of love for another. Parents get up in the middle of the night to feed or console their children. Adults care for their aging parents. Siblings and good friends stop everything in order to support their loved ones through a difficult moment. We might say that we are obligated to do these things, not because someone tells us we must, but because we cannot imagine doing anything else. The obligation is our loving response which shows the importance of the person in our lives and our gratitude for him or her. This is a helpful way to think about our obligation to participate in Sunday Mass. We come to the Eucharistic feast, not only because the Church tells us we must, but as a response to the astounding love of God which is shown and shared through Jesus Christ.