How we cite our quotes: (Chapter.Paragraph)
Quote #4
Of the faiths that had existed before the coming of the Overlords, only a form of purified Buddhism—perhaps the most austere of all religions—still survived. The creeds that had been based upon miracles and revelations had collapsed utterly. (6.28)
Going back to the first quote for this theme: Miracles and revelations succumb to the idea that reason is the true source for morality in this novel. Calling Buddhism the most austere of all religions is a judgment call on the part of the narrator, but hey, it's his story.
Quote #5
It was strange, Karellen thought, that so many human beings still seized every opportunity for primitive behavior. They could reach the bottom of the canyon in a fraction of the time, and in far greater comfort, if they chose. Yet they preferred to be jolted along tracks which were probably as unsafe as they looked. (9.3)
Primitive behavior is a source for many of the aspects of humanity that puzzle the advanced and sophisticated Overlord. One could argue that ethics and morality are also primitive behaviors that Karellen cannot understand. After all, do we ever see Karellen do anything we could truly consider moral in the story?
Quote #6
The existence of so much leisure would have created tremendous problems a century before. Education had overcome most of these, for a well-stocked mind is safe from boredom. (10.5)
If reason and thinking are the sources of true morality in the novel, then how would someone foster a sense and understanding for that morality? Education, naturally.