"In the beginning was the Word, and the Word was
with God, and the Word was God" (John 1:1).
God was the Father. Christ was the Son.
The relationship between God, the Father, and Christ, the Son was central to Blake's theology (and mine).
This was the first pair, father and son. Every man since 'the beginning' has also been part of a pair.
Read Jerusalem plate 42 again; here Albion is the father, Los is the son. What's happening?
Blake celebrates the usual conflict between father and son-- like a 20th century father and a 21st century son, like the sixties flower boys and their fathers, like America and King George in 1776, and on and on we could go adding types of this archetypal relationship.
My Son, My Son!
The Generation Gap is always with us; Blake used it here to humanize God, much as C.G.Jung was to do with Answer to Job. They also help us (poor suffering sinners) to rise above the conventional image of God imprinted upon the public by our so called religious leaders.
Before the end of Jerusalem Albion and Los had achieved an amiable (loving?) relationship, as most of us rebels do with our fathers when we mature (fortunate if they are still alive).