A magnificent homily from Pope Benedict XVI on Friday morning. A couple of paragraphs:

Christian tradition has always considered Saint Peter and Saint Paul to be inseparable: indeed, together, they represent the whole Gospel of Christ. In Rome, their bond as brothers in the faith came to acquire a particular significance. Indeed, the Christian community of this City considered them a kind of counterbalance to the mythical Romulus and Remus, the two brothers held to be the founders of Rome. A further parallel comes to mind, still on the theme of brothers: whereas the first biblical pair of brothers demonstrate the effects of sin, as Cain kills Abel, yet Peter and Paul, much as they differ from one another in human terms and notwithstanding the conflicts that arose in their relationship, illustrate a new way of being brothers, lived according to the Gospel, an authentic way made possible by the grace of Christ’s Gospel working within them. Only by following Jesus does one arrive at this new brotherhood: this is the first and fundamental message that today’s solemnity presents to each one of us, the importance of which is mirrored in the pursuit of full communion, so earnestly desired by the ecumenical Patriarch and the Bishop of Rome, as indeed by all Christians…

.. in today’s Gospel there emerges powerfully the clear promise made by Jesus: “the gates of the underworld”, that is, the forces of evil, will not prevail, “non praevalebunt”. One is reminded of the account of the call of the prophet Jeremiah, to whom the Lord said, when entrusting him with his mission: “Behold, I make you this day a fortified city, an iron pillar, and bronze walls, against the whole land, against the kings of Judah, its princes, its priests, and the people of the land. They will fight against you; but they shall not prevail against you, for I am with you, says the Lord, to deliver you!” (Jer 1:18-19). In truth, the promise that Jesus makes to Peter is even greater than those made to the prophets of old: they, indeed, were threatened only by human enemies, whereas Peter will have to be defended from the “gates of the underworld”, from the destructive power of evil. Jeremiah receives a promise that affects him as a person and his prophetic ministry; Peter receives assurances concerning the future of the Church, the new community founded by Jesus Christ, which extends to all of history, far beyond the personal existence of Peter himself…

In the light of these parallels, it appears clearly that the authority of loosing and binding consists in the power to remit sins. And this grace, which defuses the powers of chaos and evil, is at the heart of the Church’s ministry. The Church is not a community of the perfect, but a community of sinners, obliged to recognize their need for God’s love, their need to be purified through the Cross of Jesus Christ. Jesus’ sayings concerning the authority of Peter and the Apostles make it clear that God’s power is love, the love that shines forth from Calvary. Hence we can also understand why, in the Gospel account, Peter’s confession of faith is immediately followed by the first prediction of the Passion: through his death, Jesus conquered the powers of the underworld, with his blood he poured out over the world an immense flood of mercy, which cleanses the whole of humanity in its healing waters.

And from the entrance procession at that morning’s Mass:

The Westminster Abbey and Sistine Chapel Choirs together. Sound quality in this clip is not very good, sadly, but the voices are wonderful.