Taken as a whole, Cyril’s homilies form a systematic catechesis on the Christian’s rebirth through Baptism.

He tells the catechumen: “You have been caught in the nets of the Church (cf. Mt 13: 47). Be taken alive, therefore; do not escape for it is Jesus who is fishing for you, not in order to kill you but to resurrect you after death. Indeed, you must die and rise again (cf. Rom 6: 11, 14)…. Die to your sins and live to righteousness from this very day” (Procatechesis, 5).

From the doctrinal viewpoint, Cyril commented on the Jerusalem Creed with recourse to the typology of the Scriptures in a “symphonic” relationship between the two Testaments, arriving at Christ, the centre of the universe.

The typology was to be described decisively by Augustine of Hippo: “In the Old Testament there is a veiling of the New, and in the New Testament there is a revealing of the Old” (De catechizandis rudibus 4, 8).

As for the moral catechesis, it is anchored in deep unity to the doctrinal catechesis: the dogma progressively descends in souls who are thus urged to transform their pagan behaviour on the basis of new life in Christ, a gift of Baptism.

The “mystagogical” catechesis, lastly, marked the summit of the instruction that Cyril imparted, no longer to catechumens but to the newly baptized or neophytes during Easter week. He led them to discover the mysteries still hidden in the baptismal rites of the Easter Vigil.

Enlightened by the light of a deeper faith by virtue of Baptism, the neophytes were at last able to understand these mysteries better, having celebrated their rites.