Eucharist

While there are a number of ways in which the Church gathers in prayer, the Sunday eucharist is the apex of the Church's life of worship. All other forms of communal prayer, including daily Mass, flow from the celebration of the Mass on the Lord's day. Sunday Mass is clearly the ideal in light of which all other celebrations are to be understood. (Catechism of the Catholic Church, #1322-1344) ​