From the General Instruction of the Roman Missal

The celebration of Mass, as the action of Christ and the People of God arrayed hierarchically, is the center of the whole Christian life for the Church both universal and local, as well as for each of the faithful individually. In it is found the high point both of the action by which God sanctifies the world in Christ and of the worship that the human race offers to the Father, adoring him through Christ, the Son of God, in the Holy Spirit. In it, moreover, during the course of the year, the mysteries of redemption are recalled so as in some way to be made present. Furthermore, the other sacred actions and all the activities of the Christian life are bound up with it, flow from it, and are ordered to it.