After "The Price of Tomorrow" comes "A View into the Hereafter" (https://rulof.org/A-View-into-the-Hereafter-1.html). The concept of 'attunement' is introduced in this book, which is an energy-based measurement of individual and collective consciousness. It is the first book in a 27-volume 'proof-of-work' series that helps you to get to know yourself deeply, as well as the first principles of life. @Jeff Booth

Terminology: https://rulof.org/Explanation-at-soul-level.html