The realms are self-perpetuating, because we tend to continue to create the causes for whatever perceptual state we find ourselves in. We maintain this state until the point of exhaustion and we have to let go. At this point of relaxation it is possible to move from the restraints of one perceptual realm into another one, or to relax into realisation. However, once we start to feel uncomfortable with the emptiness of the unfamiliar, there is a strong tendency to re-create our former state. We are always drawn to the safety of the familiar.
Spacious Passion, Ngakma Nor’dzin, Aro books worldwide, 2006, ISBN 978-0-9653948-4-0, chapter 4 Coming up for Air, p81