Tree of Mystery

Genesis 2:7-17

[7] And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
[8] And the LORD God planted a garden eastward in Eden; and there he put the man whom he had formed.
[9] And out of the ground made the LORD God to grow every tree that is pleasant to the sight, and good for food; the tree of life also in the midst of the garden, and the tree of knowledge of good and evil.
[10] And a river went out of Eden to water the garden; and from thence it was parted, and became into four heads.
[11] The name of the first is Pison: that is it which compasseth the whole land of Havilah, where there is gold;
[12] And the gold of that land is good: there is bdellium and the onyx stone.
[13] And the name of the second river is Gihon: the same is it that compasseth the whole land of Ethiopia.
[14] And the name of the third river is Hiddekel: that is it which goeth toward the east of Assyria. And the fourth river is Euphrates.
[15] And the LORD God took the man, and put him into the garden of Eden to dress it and to keep it.
[16] And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat:
[17] But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.

This is the biblical source of the Tree of Mystery and of many other things in 'Blake'.

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The Tree of Mystery occurs once in the Book of Ahania and nowhere else except in the Four Zoas.
This extract comes from 'Ahania':

"3: For when Urizen shrunk away                      

From Eternals, he sat on a rock
Barren; a rock which himself
From redounding fancies had petrified
Many tears fell on the rock,
Many sparks of vegetation;                             
Soon shot the pained root
Of Mystery, under his heel:
It grew a thick tree; he wrote
In silence his book of iron:

- 86 -(of Erdman's book)

Till the horrid plant bending its boughs    
Grew to roots when it felt the earth
And again sprung to many a tree.

4: Amaz'd started Urizen! when
He  beheld  himself compassed round
And high roofed over with trees             
He arose but the stems stood so thick
He with difficulty and great pain
Brought his Books, all but the Book

PLATE 4
Of iron, from the dismal shade

5: The Tree still grows over the Void
Enrooting itself all around
An endless labyrinth of woe!

6: The corse of his first begotten          
On the accursed Tree of MYSTERY:
On the topmost stem of this Tree

Watercolor Illustration to Milton's Paradise Lost by William Blake

Look also at this 'Good and Evil'