“His muscles had wasted away to knotty strings, and the flesh pads had disappeared, so that each rib and every bone in his frame were outlined cleanly through the loose hide that was wrinkled in folds of emptiness. It was heartbreaking, only Buck's heart was unbreakable. The man in the red sweater had proved that.”

“This man had saved his life, which was something; but, further, he was the ideal master. Other men saw to the welfare of their dogs from a sense of duty and business expediency; he saw to the welfare of his as if they were his own children, because he could not help it. And he saw further. He never forgot a kindly greeting or a cheering word, and to sit down for a long talk with them ("gas" he called it) was as much his delight as theirs. He had a way of taking Buck's head roughly between his hands, and resting his own head upon Buck's, of shaking him back and forth, the while calling him ill names that to Buck were love names. Buck knew no greater joy than that rough embrace and the sound of murmured oaths, and at each jerk back and forth it seemed that his heart would be shaken out of his body so great was its ecstasy. And when, released, he sprang to his feet, his mouth laughing, his eyes eloquent, his throat vibrant with unuttered sound, and in that fashion remained without movement, John Thornton would reverently exclaim, "God! you can all but speak!"Buck had a trick of love expression that was akin to hurt. He would often seize Thornton's hand in his mouth and close so fiercely that the flesh bore the impress of his teeth for some time afterward. And as Buck understood the oaths to be love words, so the man understood this feigned bite for a caress.”

“In this manner had fought forgotten ancestors. They quickened the old life within him, the old tricks which they had stamped into the heredity of the breed were his tricks... And when, on the still cold nights, he pointed his nose at a star and howled long and wolflike, it was his ancestors, dead and dust, pointing nose at star and howling down through the centuries and through him.”

“As he piled wood on the fire he discovered an appreciation of his own body which he had never felt before...It fascinated him, and he grew suddenly fond of this subtle flesh of his that worked so beautifully and smoothly and delicately. Then he would cast a glance of fear at the wolf-circle drawn expectantly about him, and like a blow the realization would strike him that this wonderful body of his, this living flesh, was no more than so much meat, a quest of ravenous animals, to be torn and slashed by their hungry fangs, to be sustenance to them as the moose and the rabbit had often been sustenance to him.(Ch.3)”

“Here was intellectual life, he thought, and here was beauty, warm and wonderful as he had never dreamed it could be. He forgot himself and stared at her with hungry eyes. Here was something to live for, to win to, to fight for—ay, and die for. The books were true. There were such women in the world. She was one of them. She lent wings to his imagination, and great, luminous canvases spread themselves before him whereon loomed vague, gigantic figures of love and romance, and of heroic deeds for woman’s sake—for a pale woman, a flower of gold. And through the swaying, palpitant vision, as through a fairy mirage, he stared at the real woman, sitting there and talking of literature and art. He listened as well, but he stared, unconscious of the fixity of his gaze or of the fact that all that was essentially masculine in his nature was shining in his eyes. But she, who knew little of the world of men, being a woman, was keenly aware of his burning eyes. She had never had men look at her in such fashion, and it embarrassed her. She stumbled and halted in her utterance. The thread of argument slipped from her. He frightened her, and at the same time it was strangely pleasant to be so looked upon. Her training warned her of peril and of wrong, subtle, mysterious, luring; while her instincts rang clarion-voiced through her being, impelling her to hurdle caste and place and gain to this traveller from another world, to this uncouth young fellow with lacerated hands and a line of raw red caused by the unaccustomed linen at his throat, who, all too evidently, was soiled and tainted by ungracious existence. She was clean, and her cleanness revolted; but she was woman, and she was just beginning to learn the paradox of woman.”

“They were his environment, these men, and they were moulding the clay of him into a more ferocious thing than had been intended by Nature. Nevertheless, Nature had given him plasticity. Where many another animal would have died or had its spirit broken, he adjusted himself and lived, and at no expense of the spirit.”

“His bondage had softened him. Irresponsibility had weakened him. He had forgotten how to shift for himself. The night yawned about him.”