The book you are about to read is a collection of posts, which have been published on the Internet, and elsewhere, under the name of "Channeled Messages of High Frequencies by RZ".
The messages are channelled from what is often referred to, as the "higher self (selves) and "the all knowing self".
Channelling is a natural and inborn state of being, where there is a flawless communication between the physical and non-physical realities, which ultimately are your own undivided self.