The Mahatma Letters to A.P. SinnetThe Mahatma Letters to A. P. Sinnet by the Mahatmas M. and K. H. Compiled by A. T. Barker. Arranged and edited by Vincente Hao Chin, Jr. The Mahatma Letters to A. P. Sinnet is one of the classics of Theosophical literature. First published in 1923, they are letters written by the Mahatmas Koot Hoomi and Morya to A. P. Sinnet and A. O. Hume during the early years of the Theosophical Society. The depth and profundity of the teachings therein have been a