Quote from The Urantia Book

"...some planets (or even systems) have plunged far into spiritual darkness, they are in a certain sense quarantined, or partially isolated from intercourse with the larger units of creation. And all this, as it operates on Urantia, is a spiritually defensive reaction of the majority of the worlds to save themselves, as far as possible, from suffering the isolating consequences of the alienating acts of a headstrong, wicked, and rebellious minority." - The Urantia Book