'In order to free the world, prostrate in darkness and bound by numerous pagan errors, from the power of the devil who held it a wretched prisoner after the fall of our first parent, the heavenly shepherd, Christ our Lord, by his ineffable mercy, condescended to take flesh and, as a living victim, offer himself to God for us on the wood of the cross, nailing the guarantee of our redemption to the wood of the cross as a proof of his love for us. Then before returning to heaven he left on earth the Catholic Church his bride, as a new city, a holy Jerusalem, coming down from heaven without wrinkle or spot, one and holy, protected by his mighty weapons against the gates of hell. Its government he entrusted to the prince of the apostles, Peter, and his successors; they are to preserve whole and entire the teaching drawn from his lips, lest the sheep redeemed by his precious blood feed on poisonous ideas and fall back into age-old errors. This power sacred Scripture teaches us he entrusted especially to blessed Peter. For to which of the apostles but Peter did he say: "Feed my sheep." And again: "I have prayed for you that your faith may not fail; and when once you have turned, strengthen your brothers." Therefore, we who occupy Peter's throne and possess power equal to his, not by our own merits but because of almighty God's inscrutable wisdom, steadfastly desire that the Christian people embrace that faith proclaimed by Christ our Lord through his apostles in a continuous and uninterrupted tradition; the faith which he promised will endure to the end of the world.'