This is it: The Art of Metaphysical Demonstration

In this very thought provoking work, Dr. Murphy covers many of the deepest issues of life (and death) that perplex the mind. The author's lucid, matter of fact writing style should be very helpful with the Truth student's understanding of many of the seemingly abstract concepts put forward by Thomas Toward in his lectures on mental science. This audiobook is a must for all serious students of metaphysics and spiritual science.