"And, for an instant, she stared directly into those soft blue eyes and knew, with an instinctive mammalian certainty, that the exceedingly rich were no longer even remotely human"

This quote talks to the idea that those who have achieved fantastic wealth have become so gotten rid of from the daily struggles of the average individual that they have ended up being something else entirely. The speaker is describing a moment when the protagonist checks out the eyes of somebody who is exceedingly wealthy and understands that they are no longer human. This minute of awareness is described as an instinctive mammalian certainty, recommending that the protagonist has a deep, primal understanding of the distinction in between the rich and the average individual. This quote talks to the idea that wealth can produce a divide between people, and that those who have accomplished great wealth have ended up being something else totally.