The Celebration of Eucharist is the center of Christian life:

The liturgy is the summit toward which the activity of the Church is directed; it is also the font from which all her power flows. For the goal of apostolic endeavor is that all who are made sons of God by faith and baptism should come together to praise God in the midst of his Church, to take part in the Sacrifice and to eat the Lord’s Supper.  (Constitution on the Sacred Liturgy #10)