Again, the Trinity was explained:
God the Father represents ĪśvaraGod the Son represents GuruGod the Holy Spirit represents ĀtmanĪśvaro gururātmeti murti bhedā vibhāginā vyomavadvyāpta dehāya daksināmurtaye namah.meaning that God appears to his devotee in the form of a (son of God) and points out to him the immanence of the Holy Spirit. That is to say that God is spirit, that this spirit is immanent everywhere and that the Self must be realised, which is the same as realising God.