Pauli Mathering's Theology of Boving

Boving's vision is very wide while at the same time. There's a lot of detailed trees in the middle of a very vast forest that he touches on. He works theologically first and then you say later on in his biography. He doesn't leave his theology behind. Research writing about a whole bunch of other things more than revising his reform diagram. If you had to centralize for people or summarize, what is that central driving theological thought within which Boving kind of subsumes the whole?