The late Mogok Sayadaw Gyi, Agga Maha Pandita, Sayadaw U Vimala gave this talk ' Thit Sar Theet Hmu - A yay kyee pon Tayar Daw ' on 19th March 1961 . Sayadaw Gyi passed away in October 1962 and was believed to have attained Nibbana and had delivered more than a thousand one-hour talks mostly from his base monasteries in Mogok and Amarapura, in Upper Burma.