The deep divine knowledge and understanding. Tat Gyan is the highest level of Brahamgian. The person who reaches this level of Brahamgian can never slip back. Until we are blessed with the GurParsaad of Tat Gyan and we become Tat Key Baytay, we are very likely to slip back. Another very important point to understand is that the divine wisdom, the Puran Tat Gyan, doesn’t come by reading many religious books. Puran Tat Gyan is also not achieved by reading GurBani on a daily basis. Puran Tat Gyan is also not achieved by any other means such as doing Yoga and other religious rituals. Puran Tat Gyan comes from within when our Bandgi or Simran reaches that level after all of our Bajjar Kapaats are opened, Dasam Duaar is opened, Sat Sarovars are enlightened with Naam, Kundalini is awakened and our Hirda is blessed with Puran Jyot Parkash and our Bandgi is accepted in the Dargah. Therefore, for reaching this level of spirituality we have to focus on the eternal treasure of Naam, the GurParsaad.