Dies Domini - Parts 47 & 48 - Pope John Paul II
The Code of Canon Law of 1917 for the first time gathered this tradition into a universal law.(81) The present Code reiterates this, saying that "on Sundays and other holy days of obligation the faithful are bound to attend Mass".(82) This legislation has normally been understood as entailing a grave obligation: this is the teaching of the Catechism of the Catholic Church,(83) and it is easy to understand why if we keep in mind how vital Sunday is for the Christian life.
This is why they must be convinced that it is crucially important for the life of faith that they should come together with others on Sundays to celebrate the Passover of the Lord in the sacrament of the New Covenant. It is the special responsibility of the Bishops, therefore, "to ensure that Sunday is appreciated by all the faithful, kept holy and celebrated as truly 'the Lord's Day', on which the Church comes together to renew the remembrance of the Easter mystery in hearing the word of God, in offering the sacrifice of the Lord, in keeping the day holy by means of prayer, works of charity and abstention from work".(84)