Tat Tvam Asi or Atat Tvam Asi? Here is an article in English with a number of rare quotations from Upanishads, Bhagavatam, etc.: https://paramsatyaadvaitavedanta.quora.com/Tat-Tvam-Asi-or-Atat-Tvam-Asi It is penned by a young sincere seeker. The comments section of the article too contains many valuable citations. regards subbu