For me "Masters of Life" is a spiritual fiction ... But in terms of spiritual writings, the most important is not whether this is factually true ... The most important is that we can in pull a little matter (or energy) to move forward on our own path, to a little more freedom, serenity and happiness. And "Master of Life" makes us understand that man is probably far greater than one might believe. Better than we do understand ... sometimes it makes us "feel" this inner Master's in everyone's heart. For me there are quite a few books of this spiritual stature. Maybe "The Prophet" by Gibran ... or "Livinsgton Jonathan Seagull" by Bach ... or more recently "The gift of the prophet" Chris Iwen. Spalding thank you for making the Masters live under his pen: whether true or not, no matter, as long as it makes us a little stronger.
