Reading Jenson, I came across this bit and thought it a particularly helpful glimpse of the development of Trinitarian teaching. I’d tried to gesture toward something of this sort in comments on an earlier post.
“Typical of the titles is ‘Lord.’ Initially the disciples’ unproblematic form of address for their rabbi, it was naturally resumed after the Resurrection. But now their Lord was enthroned at the Father’s right hand and was the giver of the Spirit. In these circumstances, the address could not but resonate with the Bible’s use of ‘Lord’ for God himself—to whom is one speaking when one says ‘Lord’ to the heavens? This resonance is itself the doctrine. Only when Greek theology appears as interlocutor will or need it be asked what kind of ‘being’—divine, human, or mediating—the risen Jesus must have to be truly addressed as Lord.”
Robert W. Jenson, Systematic Theology: The Triune God (Oxford: Oxford University Press, 1997), 92.