Etz Chaim: The Tree of Life: YHWH's Seals in the Sephirot

See Cube: Seals for a more complete discussion of role of the seals of YHWH in the Sephirot five through ten. Here we can focus on the fact that the lower six are linked two at a time through their permutations of the seals, in the order of the Name: Yod (existence), Hay (life) and Waw (union). The fifth Sephirot is sealed twice by Yod-Hay-Waw: once for the inner life of the first four Sephirot, and once for the outer life of the last six.