From this point on, the term Lord is used in only one way: to refer to the Savior of the world, Jesus Christ; and the name “Lord” is used without any additions.
He is acknowledged and revered as Lord throughout heaven because he possesses all power in heaven and on earth. He also commanded this when he said, “You address me as ‘Lord.’ You speak correctly, because so I am” (John 13:13). And his disciples called him Lord after the resurrection.
In the whole of heaven no one knows of any other Father than the Lord, since the Father and the Lord are one. As he himself said:
“I am the way and the truth and life.” Philip says, “Show us the Father.” Jesus says to him, “After all the time I’ve spent with you, don’t you know me, Philip? Whoever has seen me has seen the Father. How then can you say, ‘Show us the Father’? Don’t you believe that I am in the Father and the Father is in me? Believe me, that I am in the Father and the Father is in me.” (John 14:6, 8, 9, 10, 11)
from Regeneration, Pages 122-123