CCC 1386
© Libreria Editrice Vaticana Source: vatican.va
Before so great a sacrament, the faithful can only echo humbly and with ardent faith the words of the Centurion: "Domine, non sum dignus ut intres sub tectum meum, sed tantum dic verbo, et sanabitur anima mea" ("Lord, I am not worthy that you should enter under my roof, but only say the word and my soul will be healed."). Roman Missal, response to the invitation to communion; cf. Mt 8:8[ETML:C/]. and in the Divine Liturgy of St. John Chrysostom the faithful pray in the same spirit:
O Son of God, bring me into communion today with your mystical supper. I shall not tell your enemies the secret, nor kiss you with Judas' kiss. But like the good thief I cry, "Jesus, remember me when you come into your kingdom."
Read the full chapter 1. The Sacraments of Christian Initiation ¶1212–1419