By a tradition handed down from the apostles which took its origin from the very day of Christ's Resurrection, the Church celebrates the Paschal mystery every seventh day, which day is appropriately called the Lord's Day or Sunday. God himself created the visible world in all its richness, diversity, and order. Catechesis on creation is of major importance. All human life, and therefore all human time, must become praise of the Creator and thanksgiving to him. But man's relationship with God also demands times of explicit prayer in which the relationship becomes an intense dialogue, involving every dimension of the person.
Prayer is the life of the new heart.
It ought to animate us at every moment. But we tend to forget him who is our life and our all. Because the Third Commandment depends upon the remembrance of God's saving works and because Christians saw the definitive time inaugurated by Christ as a new beginning, they made the first day after the Sabbath a festive day, for that was the day on which the Lord rose from the dead. Creation was fashioned with a view to the sabbath and therefore for the worship and adoration of God. Worship is inscribed in the order of creation.