Wherever there is an ascendant class, a large portion of the morality emanates from its class interests and its class feelings of superiority. - Jack London

Buck found it to be cheaper to mend his ways than to retaliate.

The proper function of man is to live, not to exist. I shall not waste my days in trying to prolong them. I shall use my time.

He was disappointed in it all. He had developed into an alien. As the steam beer had tasted raw, so their companionship seemed raw to him. He was too far removed. Too many thousands of opened books yawned between them and him. He had exiled himself. He had travelled in the vast realm of intellect until he could no longer return home. On the other hand, he was human, and his gregarious need for companionship remained unsatisfied. He had found no new home.