Yesod

Yesod (Hebrew: יסוד "foundation") is a sephirah in the kabbalistic Tree of Life. Yesod is the sephirah below Hod and Netzach, and above Malkuth (the kingdom). It can be seen as the vehicle, from one thing or condition to another (the power of connection).

Yesod is the foundation upon which God has built the world. It also serves as a transmitter between the sephirot above, and the reality below. The light of the upper sephirot gather in Yesod and are channelled to Malkuth below. In this manner, Yesod is associated with the sexual organs. The masculine Yesod collects the vital forces of the sephirot above, and transmits these creative and vital energies into the feminine Malkuth below. Yesod channels, Malkuth receives. In turn, it is through Malkuth that the earth is able to interact with the divinity.

It plays the role of collecting and balancing the different and opposing energies of Hod and Netzach, and also from Tiferet above it, storing and distributing it throughout the world. It is likened to the 'engine-room' of creation. The Cherubim is the angelic choir connected to Yesod, headed by the Archangel Gabriel. In contrast, the demonic order in the Qliphothic sphere opposite of Yesod is Gamaliel, ruled by the Archdemon Lilith.

The third person of the Holy Trinity, the Holy Spirit, is the Christian counterpart of Yesod. The Holy Spirit is seen by mainstream Christians as one Person of the Triune God, who revealed His Holy Name YHWH to his people Israel, sent His Eternally Begotten Son Jesus to save them from their Sins, and sent the Holy Spirit to sanctify and give life to his Church. The Holy Spirit is known as the aspect of god that sanctifies mankind, unifying God with it. Yesod is responsible for the powers of communication, connection and contact with external reality within the soul, unifying Malkuth with the other Sephiroth.

...
Wikipedia