"Brothers, when it comes to fulfilling my duties as bishop, I discover that I am weak and slack, weighed down by the weakness of my own condition, while at the same time, I want to act generously and courageously. However, I draw my strength from the untiring intercession of the almighty and eternal Priest who, like us but equal to the Father, lowered his divinity to the level of man and raised humankind to the level of God. The decisions he made give me a just and holy joy. For when he delegated many pastors to care for his flock, he did not abandon watching over his beloved sheep. Thanks to that fundamental and eternal help, I in turn have received the protection and support of the apostle Peter, who also does not abandon his function. This solid foundation, on which the whole of the Church is built, never grows tired of carrying the whole weight of the building that rests on it.
The firmness of faith, for which the first of the apostles was praised, never fails. Just as everything that Peter professed in Christ remains, so what Christ established in Peter remains… The order willed by God’s truth remains. Saint Peter perseveres in the solidity that he received; he has not abandoned the governance of the Church, which was placed in his hands. That, my brothers, is what that profession of faith inspired by God the Father obtained in the heart of the apostle. He received the solidity of a rock, which no assault can shake. In the entire Church, Peter says every day: “You are the Messiah, the Son of the living God.” "
-Pope St. Leo the Great (d. 461)