The Tetractys

Tetractys of the Decad:
One, two, three and four
in union; musica universalis -
Unity; Dyad; Harmony; Kosmos.

And too, the dimensions:
One - a point; two - a line,
Three - a surface, triangular,
Four - a volume, tetrahedral.

"By that pure, holy, four lettered name on high,
nature's eternal fountain and supply,
the parent of all souls that living be,
by him, with faith find oath, I swear to thee"