Here are some C.S. Lewis quotes that I'm reading as I go through That Hideous Strength again. These are really powerful, but I'm not going to add my personal commentary for lack of time.
"But he knew that [horrible thing] was true. And he could not, as they say, "take it." He was very ashamed of this, for he wished to be considered one of the tough ones. But the truth is that his toughness was only of the will, not of the nerves, and the virtues he had almost succeeded in banishing from his mind still lived, if only negatively and as weaknesses, in his body. he approved of vivisection, but had never worked in a dissecting room. He recommended that certain classes of people should be gradually eliminated: but he had never been there when a small shopkeeper went to the workhouse or a starved old woman of the governess type came to the very last day and hour and minute in the cold attic. He knew nothing about the last half cup of cocoa drunk slowly ten days before." -C.S. Lewis, That Hideous Strength.
"In their eyes the normal Tellurian modes of being-engendering and birth and death and decay-which are to us the framework of thought, were no less wonderful than the countless other patterns of being which were continually present to their unsleeping minds. To those high creatures whose activity builds what we call Nature, nothing is "natural." From their station the essential arbitrariness (so to call it) of every actual creation is ceaselessly visible; for them there are no basic assumptions: all springs with the willful beauty of a jest or a tune from that miraculous moment of self-limitation wherein the Infinite, rejecting a myriad possibilities, throws out of Himself the positive and elected invention." -CS Lewis
"Frost had left the dining room a few minutes after Wither. He did not know where he was going or what he was about to do. For many years he had theoretically believed that all which appears in the mind as motive or intention is merely a by-product of what the body is doing. But for the last year or so - since he had been initiated - he had begun to taste as fact what he had long held as theory. Increasingly, his actions had been without motive. He did this and that, he said thus and thus, and did not know why. His mind was a mere spectator. He could not understand why that spectator should exist at all. He resented its existence, even while assuring himself that resentment also was merely a chemical phenomenon. The nearest thing to a human passion which still existed in him was a sort of cold fury against all who believed in the mind. There was no tolerating such an illusion. There were not, and must not be, such things as men. But never, until this evening, had he been quite so vividly aware that the body and its movements were the only reality, that the self which seemed to watch... was a nonentity. How infuriating that the body should have power thus to project a phantom self!" - C.S. Lewis