 Bulent Rauf dedicated many years of his life to teaching the Islamic concept of "the one Absolute Unity of all existence" "(tawhid)".Among other things, the British mystic and author Reshad Feild, who portrayed him as "Hamid" in his well-known book "The Last Barrier", considered him to be his 'teacher'.However, Bulent Rauf himself emphasized the Islamic view that Muhammad was the final prophet, and that each person is taught directly by their own life with no intermediary.