What Jesus said to Simon in Matthew 16:18 was this: ‘You are Kepha, and on this kepha I will build my Church. The linguistical debate has gone on without end (see below for more) but interpretation must be done in the light of the whole of Scripture.
The verse at issue, v.18, cannot be divorced from that which preceded it, in which the identity of Jesus Christ is the main subject. In the next verse (17) that is what Jesus refers to in telling blessed Peter that “flesh and blood hath not revealed it unto thee,” and in v. 18 that truth is what the “this rock” refers to, as the CCC allows, “On the rock of this faith confessed by St Peter, Christ build his Church,” (CCC 424) which understanding has strong support even from so-called church fathers. .
This is the only interpretation that is confirmed, as it must be, in the rest of the New Testament. Nowhere does in the rest of the NT is Peter called the rock upon which the church is built, but in contrast to Peter, that the LORD Jesus is the Rock (“petra”) or "stone" (“lithos,” and which denotes a large rock in Mk. 16:4) upon which the church is built is one of the most abundantly confirmed doctrines in the Bible
For that the LORD Jesus is the Rock (“petra”) or "stone" (“lithos,” and which denotes a large rock in Mk. 16:4) upon which the church is built is one of the most abundantly confirmed doctrines in the Bible (petra: Rm. 9:33; 1Cor. 10:4; 1Pet. 2:8; cf. Lk. 6:48; 1Cor. 3:11; lithos: Mat. 21:42; Mk.12:10-11; Lk. 20:17-18; Act. 4:11; Rm. 9:33; Eph. 2:20; cf. Dt. 32:4, Is. 28:16) including by Peter himself. (1Pt. 2:4-8)
Moreover, the idea of a church looking to Peter as the first of a line of assuredly infallible popes reigning over them as as their supreme exalted head is invisible in Scripture .
As is the premise that an assuredly infallible of doctrine is essential for determination and assurance of Truth, and thus the assured veracity of Rome is the basis for assurance of Truth.
And thus as Keating asserts,
The mere fact that the Church teaches the doctrine of the Assumption as definitely true is a guarantee that it is true. ” — Karl Keating, Catholicism and Fundamentalism (San Francisco: Ignatius, 1988), p. 275.[http://www.catholic.com/tracts/immaculate-conception-and-assumption]
As concerns the Aramiac vs Greek debate, i will just add to it by providing this:
an Aramaic word-play -- I should say, a possible Aramaic word-play, that nobody really understands -- is foundational to Roman and papal authority.
Both David Garland (“Reading Matthew: A Literary and Theological Commentary on the First Gospel”, New York: Crossroad Publishing, 1995) and Everett Ferguson (“The Church of Christ: A Biblical Ecclesiology for Today”, Grand Rapids/Cambridge: Eerdmans Publishing Co, 1996) point to the 1990 study by C.C. Caragounis, “Peter and the Rock” (Berlin: Walter de Gruyter)
Here’s Garland’s account:
C.C. Caragounis’s study of this passage carefully argues, however, that the rock refers to something other than Peter. The demonstrative pronoun “this” [in the phrase “on this rock”] logically should refer to something other than the speaker or the one spoken to and would be appropriate only if Jesus were speaking about Peter in the third person and not speaking to him. If Jesus were referring to Peter, it would have been clearer to have, “You are Rock, and upon you I will build my church” (Caragounis 89). Petros usually meant a free-standing “stone” that could be picked up; and petrausually was used to mean “rock,” “cliff,” or “bedrock.” But the two terms could reverse their meaning and no clear-cut distinction can be made between the two (Caragounis, 12, 15). If the two words were intended to refer to the same thing, petros could have been used in both places since it could be used to mean both stone and rock. The use of two different terms in the saying, petros and petra, implies that the two were to be distinguished from each other. More
As I pointed out earlier, these discussions are repeated on multiple threads, over and over again. Jesus spoke Aramaic, as did His disciples. Greek and Aramaic have different grammatical structures. In Aramaic you can use kepha in both places in Matthew 16:18. In Greek you encounter a problem arising from the fact that nouns take differing gender endings.
"You have masculine, feminine, and neuter nouns. The Greek word petra is feminine. You can use it in the second half of Matthew 16:18 without any trouble. But you can’t use it as Simon’s new name, because you can’t give a man a feminine name—at least back then you couldn’t. You have to change the ending of the noun to make it masculine. When you do that, you get Petros, which was an already-existing word meaning rock.
Beyond the grammatical evidence, the structure of the narrative does not allow for a downplaying of Peter’s role in the Church. Look at the way Matthew 16:15-19 is structured. After Peter gives a confession about the identity of Jesus, the Lord does the same in return for Peter. Jesus does not say, "Blessed are you, Simon Bar-Jona! For flesh and blood has not revealed this to you, but my Father who is in heaven. And I tell you, you are an insignificant pebble and on this rock I will build my Church. . . . I will give you the keys of the kingdom of heaven." Jesus is giving Peter a three-fold blessing, including the gift of the keys to the kingdom, not undermining his authority. To say that Jesus is downplaying Peter flies in the face of the context. Jesus is installing Peter as a form of chief steward or prime minister under the King of Kings by giving him the keys to the kingdom. As can be seen in Isaiah 22:22, kings in the Old Testament appointed a chief steward to serve under them in a position of great authority to rule over the inhabitants of the kingdom. Jesus quotes almost verbatum from this passage in Isaiah, and so it is clear what he has in mind. He is raising Peter up as a father figure to the household of faith (Is. 22:21), to lead them and guide the flock (John 21:15-17). This authority of the prime minister under the king was passed on from one man to another down through the ages by the giving of the keys, which were worn on the shoulder as a sign of authority. Likewise, the authority of Peter has been passed down for 2000 years by means of the papacy.