[maryz]

The epistles (all of them together) are the totality of the instructions to the church.

Really? The writers of the epistles seem to intend them to churches that are already going concerns.

[editor-surveyor]

> “The writers of the epistles seem to intend them to churches that are already going concerns.”

.
Yes, as they were obviously continuation of synogogues that had been going for probably over a century. They needed instruction, and clarification, which Paul in particular gave them in great detail.