Mateus 16
Cyril of Alexandria · Comentário Patrístico (catena)
Mateus 16:16
Peter did not say "you are a Christ" or "a son of God" but "the Christ, the Son of God." For there are many christs by grace, who have attained the rank of adoption [as sons], but [there is] only one who is by nature the Son of God. Thus, using the definite article, he said, the Christ, the Son of God. And in calling him Son of the living God, Peter indicates that Christ himself is life and that death has no authority over him. And even if the flesh, for a short while, was weak and died, nevertheless it rose again, since the Word, who indwelled it, could not be held under the bonds of death. — FRAGMENT 190
Mateus 16:18
[(as quoted by Aquinas, AD 1274)] CYRIL OF ALEXANDRIA.s; According to this promise of the Lord, the Apostolic Church of Peter remains pure and spotless from all leading into error, or heretical fraud, above all Heads and Bishops, and Primates of Churches and people, with its own Pontiffs, with most abundant faith, and the authority of Peter. And while other Churches have to blush for the error of some of their members, this reigns alone immoveably established, enforcing silence, and stopping the mouths of all heretics; and wet, not drunken with the wine of pride, confess together with it the type of truth, and of the holy apostolic tradition. — Catena Aurea by Aquinas
Mateus 16:28
Since the disciples had not yet received power from on high, it was perhaps not unnatural that they should fall occasionally into human weaknesses and, thinking something of this sort, say, "How shall someone deny himself? Or how can someone, by losing his own life, save it?" …Therefore, to lead them away from reasonings of this sort and, so to speak, forge courage anew within them, communicating to them a longing for the glory to come, he says, "There are some standing here," hinting at Peter and the sons of Zebedee; for these were taken up with him at the transfiguration, which Christ calls "the kingdom," as demonstrating the ineffability of [his] authority and the immutable nature of [his] kinship with the Father. And in this [saying] he also hints at the importance and the fearfulness of his second coming, showing this coming to be a prelude and, as it were, a confirmation of that. For he will come "in the glory of God, the Father," not in the humble condition that is commensurate with us. — FRAGMENT 195