Meher Baba's message dictated to Sanjeeva Reddy at Guruprasad (June 6, 1960), as quoted in Charles Benjamin Purdom "The God Man: The Life, Journeys and Work of Meher Baba with an Interpretation of His Silence and Spiritual Teaching" (p. 353), December 25, 1964.
Meher Baba (1977). “The Mastery of Consciousness: An Introduction and Guide to Practical Mysticism and Methods of Spiritual Development”, HarperCollins Publishers