As far as apostolic succession is concerned, The Catholic Church derives a hierarchical structure from a tradition that stretches back to the primitive Church. Today, there is often less credence given to any “handing on” of practices, and it is true that we do not have a Scriptural record of any explicit instruction given to the apostles by Christ Himself. However, the appointment of successors does seem implicit in the nature of the commission He gives them. The Gospel is to be proclaimed until the end of time, and yet no new channel of revelation was instituted. The faith deposited by Jesus Christ must then be contained, intact, in perpetude. This is a fundamental tenet of the Catholic Church then: it must be apostolic in terms of both its teaching and its origins:
The Church of Christ knows that its teaching should be identical with the message announced by the apostles.
Apostolic succession then, is a matter of purity: the purity of the Gospel and the preaching of an unabridged and undistorted message, identical with that preached by Christ two thousand years ago. The common Protestant objection to the perpetuity of the apostolic office is based on the unique nature of the apostle’s witness. This is correct in that the apostles preached about what they themselves had seen and heard. It would be true that any successors to these original witnesses could not receive any new revelation.
The apostles had a unique foundational role, and can have no successors in that task.
Yet an examination of Scripture reveals that Christ asserts that He will remain present with the apostles until the end of time (Mt 28:20); He commands them to carry the Gospel to the ends of the earth (Acts 1:8); and He calls another apostle, Paul, after His ascension and gives him a particular, extensive mission. It seems clear then, that Jesus’ mission must be carried on after the death of the apostles. Since Jesus founded His Church on men and on the saving encounter of man with man (and not on a book), the mission of spreading the Gospel requires preachers:
The objectivised message of salvation becomes capable of being heard only through the word of the proclaimer.
This is the very nature of the kerygma, as it cannot be discovered through reflection or any inner process, but rather is a Word which is given, passed from one to another.
According to Schmaus, despite the necessity for all baptised Christians to bear witness to Christ, the authentic or binding proclamation could only occur through those who were directly appointed by Jesus Christ Himself. These were the apostles, not just the twelve, but (according to Luke 10: 1-20) but others, also. This scene in Luke is reminiscent of an Old Testament scene (Num 11:16f) where Moses is asked by God to choose seventy elders to rule the people of God with him. This seventy shared in his authority. Schmaus asserts that these were the first bishops, and that new members were appointed to fill gaps—for example the appointment of Matthias at the suggestion of Peter to fill up the college of apostles after the desertion of Judas (Acts 1:15-26).
Richard McBrien offers a critique of this idea based on two observations. Firstly, he asserts that a bishop is a residential pastor of a diocese, whereas the first apostles were “missionaries and founders of local churches.” Secondly, he notes that although some local churches were led by bishops (Gk. episkopoi, cf. Acts 20:17-35), it is unclear whether these were appointed by St. Paul, or indeed any apostle.
The point McBrien makes, is that the idea of each validly ordained Catholic bishop being able to trace his Episcopal ordination in an unbroken line back to one of the original twelve apostles is a “simplistic [and] mechanistic notion”. McBrien supports the theories which, he purports, are upheld by “most other Catholic theologians writing after Vatican II”, yet I would say is most clearly put forward by the Protestant theologian Karl Barth; that to view apostolicity in purely historical or juridicial grounds, or to limit it to Episcopal ordination would presume to control the workings of the Holy Spirit, limiting His work to being “transferred” from one person to another.
The alternative postulated, is one which holds true to the ideals espoused by Martin Luther:
The true apostolic succession is the Gospel. Whoever preaches the pure Gospel stands in apostolic succession.
The important element of what McBrien states here should not be confused with rebellion; it is not that he considers the doctrine of apostolic succession as defined in Lumen Gentium ¶ 20 “is without any theological or historical basis. It is just that this particular explanation of it is not valid.” Rather, the emphasis on the definition in LG ¶ 20, that apostolic succession is “by divine institution” should be more that the development of the Church’s hierarchy took place under the guidance and direction of the Holy Spirit, than the passing on of a baton.
It seems to me that these are very subtle arguments. My own experience discussing this issue with Protestants is that it tends to lead to a sticky dead end if one chooses to rigidly try and prove that Christ explicitly determined the Episcopal structures of the local churches. Raymond Brown asserts Christ did not leave a blueprint for the Church to follow precise organisational directions. He did lay the foundations for the Church in various, indirect ways; the gathering of disciples, the institution of the Eucharist, etc.