"The stone rejected by the builders has become the cornerstone" (Ps 118:22).

With these words of the Psalm, the Easter liturgy expresses a central truth of faith. The Church believes that God builds his Kingdom in the world. The construction rests on the cornerstone. The Paschal Mystery is the revelation of this stone, upon which God himself builds his Kingdom. The fact that men have discarded this stone reveals even more clearly that God Himself is the builder of the Kingdom, which, however, is realised in men and through men, despite their contradictions; the Kingdom of God, in fact, is their ultimate eternal vocation.

This reality finds its dramatic expression precisely in the paschal mystery: [...] the liturgy has attested to it in a special way. Moreover, she always testifies to this, every day, in every Eucharistic celebration, highlighting the truth about Christ, who is the cornerstone. Discarded by the builders, Christ manifested Himself as the One on whom the whole building of God's Kingdom in the world rests.

[Pope John Paul II, homily 7 April 1991]