Ok, I have always understood "cornerstone" as the stone that goes at the corner of a foundation and it helps support 2 of the main walls that are built upon it. Remove the Cornerstone and the whole building collapses. Right?
Well, last Sunday I heard the Sunday "school" teacher, say that the Cornerstone was not what I had always heard, but that it was a "keystone" that locked into place the stones of an arch.
I was reading every commentary I have and to my surprise WBC says that, "It may be a foundation stone binding two walls at the corner of a building, or it may be a keystone locking into place the stones of an arch or some similarly constructed feature of a building. There are other suggestions as well. The difference of imagery does not affect the final sense."
Nolland, J. (1998). Luke 18:35–24:53 (Vol. 35C, p. 953). Dallas: Word, Incorporated.
Now, WBC says it may be one of the two (or some similarly constructed feature of a building), but BECNT says that it, "refers to a foundation stone, not a capstone (McKelvey 1969: 195–204 refutes Jeremias’s view, TDNT 1:793, that it refers to a capstone; Eph. 2:20 favors foundation stone; BAGD 168, 430 §2b; BAA 336 §1, 875 §2b). In the ancient world this stone bore the weight of two intersecting walls (Fitzmyer 1985: 1282) and was crucial to the building’s stability."
Bock, D. L. (1996). Luke: 9:51–24:53 (Vol. 2, p. 1603). Grand Rapids, MI: Baker Academic.
My question is: Which one is right? I'm leaning towards BECNT because Jesus is the foundation and you take him out the whole building collapses. I do not go with the Sunday school teacher's explanation because the whole building would not collapse by taking away the "keystone" or "capstone" only the arch would collapse.
What do you guys say about this? Should I pull him aside and let him know that his explanation is not really quite correct or should I just let him think his explanation is ok. I'm sure he got it from some commentary that only holds that view, because that's the only view he shared, he did not mention other options.
Any input will be greatly appreciated.
Thanks!
DAL