“Confitemini Domino quoniam bonus, quoniam in saeculum misericordia eius”; “Give thanks to the Lord for he is good; his steadfast love endures for ever” (Ps 118: 1). So the Church sings on the Octave of Easter, as if receiving from Christ's lips these words of the Psalm; from the lips of the risen Christ, who bears the great message of divine mercy and entrusts its ministry to the Apostles in the Upper Room: “Peace be with you. As the Father has sent me, even so I send you.... Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained” (Jn 20: 21-23).