Here is an interesting article by an M. James Sawyer on Protestant views of the canon of Scripture. It is interesting to note how much is actually conceded to arguments made by Catholics and Orthodox. In the end what he argues for is a return to Calvin’s view of the internal witness of the Spirit. I don’t think that gives us any objective reason or method for why Protestants accept the canon that they do. Some of my reasons can be found in Rupert Davies’ little book, The Problem of Authority in the Continental Reformers.