Moreover, you were all distinguished by humility, and were in no respect puffed up with pride, but yielded obedience rather than extorted it, and were more willing to give than to receive. [Acts 20:35] Content with the provision which God had made for you, and carefully attending to His words, you were inwardly filled with His doctrine, and His sufferings were before your eyes. Thus a profound and abundant peace was given to you all, and you had an insatiable desire for doing good, while a full outpouring of the Holy Spirit was upon you all.

Christ puts this question to His disciples, that from their answer we may learn that there were at that time among the Jews various opinions concerning Christ; and to the end that we should always investigate what opinion men may form of us; that if any ill be said of us, we may cut off the occasions of it; or if any good, we may multiply the occasions of it.

See how great power has that rock upon which the Church is built, that its sentences are to continue firm as though God gave sentence by it.

Then the disciples recount the divers opinions of the Jews relating to Christ; And they said, Some say John the Baptist, following Herod’s opinion; others Elias, (vid. Matt. 14:2.) supposing either that Elias had gone through a second birth, or that having continued alive in the body, He had at this time appeared; others Jeremias, whom the Lord had ordained to be Prophet among the Gentiles, not understanding that Jeremias was a type of Christ; or one of the Prophets, in a like way, because of those things which God spoke to them through the Prophets, yet they were not fulfilled in them, but in Christ.

Peter denied that Jesus was any of those things which the Jews supposed, by his confession, Thou art the Christ, which the Jews were ignorant of; but he added what was more, the Son of the living God, (Ezek. 33:11.) who had said by his Prophets, I live, saith the Lord. And therefore was He called the living Lord, but in a more especial manner as being eminent above all that had life; for He alone has immortality, and is the fount of life, wherefore He is rightly called God the Father; for He is life as it were flowing out of a fountain, who said, I am the life. (John 14:6.)

But in heavenly things every spiritual sin is a gate of hell, to which are opposed the gates of righteousness.

He does not express what it is which they shall not prevail against, whether the rock on which He builds the Church, or the Church which He builds on the rock; but it is clear that neither against the rock nor against the Church will the gates of hell prevail.

Wherefore if we, by the revelation of our Father who is in heaven, shall confess that Jesus Christ is the Son of God, having also our conversation in heaven, to us also shall be said, Thou art Peter; for every one is a Rock who is an imitator of Christ. But against whomsoever the gates of hell prevail, he is neither to be called a rock upon which Christ builds His Church; neither a Church, or part of the Church, which Christ builds upon a rock.

Let him then be without blame who binds or looses another, that he may be found worthy to bind or loose in heaven. Moreover, to him who shall be able by his virtues to shut the gates of hell, are given in reward the keys of the kingdom of heaven. For every kind of virtue when any has begun to practise it, as it were opens itself before Him, the Lord, namely, opening it through His grace, so that the same virtue is found to be both the gate, and the key of the gate. But it may be that each virtue is itself the kingdom of heaven.