102 All the elements of the liturgy, then, would have us reproduce in our hearts the likeness of the divine Redeemer through the mystery of the cross, according to the words of the Apostle of the Gentiles, "With Christ I am nailed to the cross. I live, now not I, but Christ liveth in me." Thus we become a victim, as it were, along with Christ to increase the glory of the eternal Father.
Source: Mediator Dei (Vatican.va)