In taking flesh, the Son of God could become Bread and thus be the nourishment of his people, of us, journeying on in this world toward the promised land of heaven. We need this bread to face the fatigue and weariness of our journey. Sunday, the Lord’s Day, is a favorable opportunity to draw strength from him, the Lord of life. The Sunday precept is not, therefore, an externally imposed duty, a burden on our shoulders. On the contrary, taking part in the Celebration, being nourished by the Eucharistic bread, and experiencing the communion of their brothers and sisters in Christ is a need for Christians, it is a joy; Christians can thus replenish the energy they need to continue on the journey we must make every week.
[Benedict XVI: Heart of the Christian Life, p. 13]