Four Zoas, Night V, Page 63, (E 342) "Into the iron rock & grew a chain beneath the Earth Even to the Center wrapping round the Center & the limbs Of Orc entering with fibres. became one with him a living Chain Sustained by the Demons life. Despair & Terror & Woe & Rage Inwrap the Parents in cold clouds as they bend howling over The terrible boy till fainting by his side the Parents fell Not long they lay Urthonas spectre found herbs of the pit Rubbing their temples he reviv'd them. all their lamentations I write not here but all their after life was lamentation When satiated with grief they returnd back to Golgonooza Enitharmon on the road of Dranthon felt the inmost gate Of her bright heart burst open & again close with a deadly pain Within her heart Vala began to reanimate in bursting sobs And when the Gate was open she beheld that dreary Deep Where bright Ahania wept. She also saw the infernal roots Of the chain of Jealousy & felt the rendings of fierce howling Orc Rending the Caverns like a mighty wind pent in the Earth Tho wide apart as furthest north is from the furthest south Urizen trembled where he lay to hear the howling terror The rocks shook the Eternal bars tuggd to & fro were rifted Outstretchd upon the stones of ice the ruins of his throne Urizen shuddring heard his trembling limbs shook the strong caves The Woes of Urizen shut up in the deep dens of Urthona Ah how shall Urizen the King submit to this dark mansion Ah how is this! Once on the heights I stretchd my throne sublime The mountains of Urizen once of silver where the sons of wisdom dwelt And on whose tops the Virgins sang are rocks of Desolation My fountains once the haunt of Swans now breed the scaly tortoise The houses of my harpers are become a haunt of crows The gardens of wisdom are become a field of horrid graves And on the bones I drop my tears & water them in vain"
The Chain of Jealousy began to develop when Los saw his son Orc as a rival for Enitharmon's affection. Each link resulted as a development led to behaviors that sunk him deeper into destruction.
For Los these were links of the Chain of Jealousy:
Los resented Orc,
Los became obsessed with Enitharmon's relationship to Orc,
Los chained Orc,
Los couldn't release Orc,
Orc stirred in the underground cavern,
Urizen was woken by Orc's stirring,
Urizen escaped from Urthona's dens.
Each link of the chain further enslaved Los. In the image Los measures the infant with the span of his hand knowing that it will grow and develop and become another link in the chain.
Blake's desire was to have the most complete use of his imagination that was possible. He saw that his emotional live had the power to interfere with his freedom to use his imagination. He tried to limit emotion in order to enjoy his visionary imagination. But when he chained desire, he couldn't access it's energy to apply it to the creative activities of his imagination. His desire was forced into the unconscious where its stirrings brought to life the reasoning mind which escaped from its constraints. By trying to release imagination from emotion he has enslaved it to reason.