Truth Guru. Heart within whom God , the Truth "SAT" , is fully manifest. That is the Guru. Sat is the Guru, Sat is Akal Purakh. The Guru is not the Deh (human body) that contains this Divine Light of God. The one who reaches the Param Padvi is a SatGur, the one who reaches the Puran Brahamgian stage is the SatGur, the one who reaches the Puran Tat Gyan stage becomes a SatGur, the one who is blessed with the Atum Ras becomes a SatGur, the one who becomes a Sat Hirda and with Puran Param Jyot Parkash becomes a SatGur, the one who becomes a Puran Sant Hirda is a SatGur. Please always and forever keep this thing in our mind and have a clear understanding of this divine truth that Sat is the Guru. Dehi is not the Guru means physical body is not the Guru, physical body is Maya and is perishable. So the physical body is not and can’t be the Guru, the Param Jyot Puran Parkash is the Guru. So whenever we bow and follow these souls we don’t follow their physical body, but we follow their Sat Roop, and that is Puran Brahamgian Atam Ras Puran Tat Gyan Puran Parkash Param Jyot.