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According to Jewish Kaballistic philosophy, Yesod is responsible for the powers of communication, connection and contact with external reality within the soul, unifying the material world of Malkuth with the other Sephiroth. Therefore, some Christians compare Yesod to the third person of the Holy Trinity, the Holy Spirit.The Holy Spirit is defined by some Christians as one aspect of the Triune God. These Christians believe that the Holy Spirit is the aspect of god that unifies God with humanity.
According to Jewish Kabbalah, 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. Yesod 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.