The notes to this book tell us that author Frank MacHovec is a retired psychologist who began his study of Eastern philosophies as a Marine during the Korean War, one who wanted to understand the mind of the enemy.
If MacHovec understands the value of Eastern ideas after over five decades in their company, it is from a realist perspective.
Accordingly, there are no levitating sadhus, silver spaceships, spells, or doors to the fourth dimension here, though you will find the book a kind of navigational chart that will help you trace concepts and practices back to their sources in the East.