The early
Church Fathers are indispensable resources for helping to bridge the gap between our own time and the age of the apostles. Not only do they provide extra biblical verification of the life and teachings of Jesus Christ, they also provide a great deal of insight into what the early Christians believed and how they interpreted Scripture.
This can go a long way to demonstrate that certain Catholic distinctives have been believed from the very beginning. One Church Father I find to be particularly helpful in apologetics is
St. Ignatius of Antioch.
Ignatius lived from around A.D. 35 to 107. He was the third bishop of Antioch and tradition records that he was a disciple of the apostle John (cf.
The Maryrdom of Ignatius). During the reign of Emperor Trajan, he was taken to Rome and suffered martyrdom there. Along the way he wrote seven letters—one to St. Polycarp of Smyrna, and six others to various churches.
On the Authority of the Catholic Church
The Greek root of the term catholic means “according to the whole” or “universal.” Ignatius uses the term to refer to the visible and authoritative Church:
See that you all follow the bishop, even as Jesus Christ does the Father, and the presbytery as you would the apostles; and reverence the deacons, as being the institution of God. Let no man do anything connected with the Church without the bishop. Let that be deemed a proper Eucharist, which is administered either by the bishop, or by one to whom he has entrusted it. Wherever the bishop shall appear, there let the multitude of the people also be; even as wherever Jesus Christ is, there is the Catholic Church.
Letter to the Smyrnaeans, Ch 8
Ignatius urges the faithful to submit to the authority of their bishop because it is the will of God:
But inasmuch as love suffers me not to be silent in regard to you, I have therefore taken upon me first to exhort you that you would all run together in accordance with the will of God. For even Jesus Christ, our inseparable life, is the manifested will of the Father; as also bishops, settled everywhere to the utmost bounds of the earth, are so by the will of Jesus Christ… Let us be careful, then, not to set ourselves in opposition to the bishop, in order that we may be subject to God.
—Letter to the Ephesians, Ch 3,5
Ignatius recognizes the authority, or “presidency,” in particular of the Church at Rome:
Ignatius, also called Theophorus, to the Church that has found mercy in the greatness of the Most High Father and in Jesus Christ, his only son; to the Church beloved and enlightened after the love of Jesus Christ, our God, by the will of him that has willed everything which is; to the Church which also holds the presidency in the place of the country of the Romans, worthy of God, worthy of honor, worthy of blessing, worthy of praise, worthy of success, worthy of sanctification, and because you hold the presidency of love, named after Christ and named after the Father; here therefore do I salute in the name of Jesus Christ, the Son of the Father.
—
Letter to the Romans, Intro
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The fact that the Middle Recension is authentic should give Protestants serious pause, since it disproves many Protestant theories about the nature of the early Church. It's no wonder Calvin rejected all of them so fiercely.