Near the beginning of Jerusalem Albion became enthralled with Vala who was fallen and material. Albion fell further and further from his true nature as the embodiment of humanity into his Selfhood.
When Albion was overcome by guilt and projected his self-hatred outward, manifestations appeared which threatened his continued existence. Los assumed the role of Albion's true self, his integrated self or identity and began the work of restoring Albion's psyche. Los knew the cost which would be assessed to him. He also knew that only through the appearance of the Lamb of God within Albion, could he be regenerated.
So Los makes this plea:
Jerusalem, Plate 82, (E 241)
"Los saw & was comforted at his Furnaces uttering thus his voice.
I know I am Urthona keeper of the Gates of Heaven,
And that I can at will expatiate in the Gardens of bliss;
But pangs of love draw me down to my loins which are
Become a fountain of veiny pipes: O Albion! my brother!
Corruptibility appears upon thy limbs, and never more
Can I arise and leave thy side, but labour here incessant
Till thy awaking! yet alas I shall forget Eternity!
Against the Patriarchal pomp and cruelty, labouring incessant
I shall become an Infant horror. Enion! Tharmas! friends
Absorb me not in such dire grief: O Albion, my brother!
Jerusalem hungers in the desart! affection to her children!
The scorn'd and contemnd youthful girl, where shall she fly?
Sussex shuts up her Villages. Hants, Devon & Wilts
Surrounded with masses of stone in orderd forms, determine then
A form for Vala and a form for Luvah, here on the Thames
Where the Victim nightly howls beneath the Druids knife:
A Form of Vegetation, nail them down on the stems of Mystery:
O when shall the Saxon return with the English his redeemed
O when shall the Lamb of God descend among the Reprobate!"
Jerusalem Plate 19 (color copy is in Blake Archive)
Los knew that becoming the intimate friend and caregiver for Albion he would have to leave the clean, secure protected envelope of his home and be among the dirty, diseased and degenerate. Albion sleeps on his couch upon the rock while Los struggles through the ugly stages of development which precede awakening.
The seamy side of life where one may be rejected, taken advantage of, deceived and plotted against is not pleasant to endure. Those who assume the burden of bearing such alienation for the sake of others are close to the Lord.
At the end of Jerusalem when Albion is repentant, it is Jesus who stands with forgiveness and healing beside Albion, but Los is present too, totally involved in the conversation between God and Man.
Jerusalem, Plate 96, (E 255)
"Then Jesus appeared standing by Albion as the Good Shepherd
By the lost Sheep that he hath found & Albion knew that it
Was the Lord the Universal Humanity, & Albion saw his Form
A Man. & they conversed as Man with Man, in Ages of Eternity
And the Divine Appearance was the likeness & similitude of Los"
"Blake considers the poet to be a crucial agent in the union of humankind with Christ. Indeed, the poet is the prophet who can foresee the apocalypse and salvation and who acts as a guide to lead the universal human to the Divine Vision."
Quote from ENOTES: Jerusalem: The emanation of the Giant Albion, William Blake - Introduction