The question
Where does “as above, so below” come from, and what did it first mean?
The short answer
It paraphrases a line of the Emerald Tablet, a short alchemical text first known in Arabic. It was about the unity of “the one thing” behind the alchemical work, and only later became a general motto about the cosmos and the self.
What science knows
Historical FactThe earliest known version of the Emerald Tablet appears in Arabic, in a work on the secrets of creation attributed to “Balinas” (Apollonius of Tyana), dated to around the 8th or 9th century.
Latin translations from the 12th century gave the line its familiar form: that which is below is like that which is above, and that which is above is like that which is below, to accomplish the miracles of the one thing.
The pattern
Cultural TraditionIn context, the tablet describes an alchemical process and the single substance behind it. Later readers took the line as a statement of macrocosm and microcosm: patterns in the heavens mirrored in human life.
What is still uncertain
Mixed EvidenceWhether the Arabic text translated an older Greek or Syriac original is debated, and its early transmission is hard to trace.
Why humans find it interesting
Historical FactIsaac Newton made his own translation of the Emerald Tablet, now among his alchemical papers. The idea of the human as a small cosmos is older still, found in ancient Greek philosophy.
CUE perspective
CUE PerspectiveCUE likes the idea behind the phrase, that patterns repeat across scales, and treats it as a lens, not a law.
Knowing the phrase began in alchemy makes it richer, and stops it being used as evidence for things it never claimed.