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"I am That Which I Am"
Exodus 3:14
And God saith unto Moses, `I AM THAT WHICH I AM;'
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as above, so below
This is a repeated, therefore deeply thematic, key phrase in M & D and Against the Day.
The phrase "as above, so below" is from an alchemical text called the
"Emerald Tablet of Hermes:"
http://www.alchemywebsite.com/emerald.html