Ascending and Descending
The circulation of energy between heaven and earth.
The Tablet describes ascending from earth to heaven and descending again to earth, thereby gaining the power of both the upper and lower things. This circulation completes the work, uniting what is above with what is below.
It ascends from the earth to the heaven and descends again to the earth, and receives the power of the upper and the lower things.
This describes the alchemical circulatio, the key operation.
The Emerald Tablet