The human race is doomed to sink back farther and farther into the primitive night ere again it begins its bloody climb upward to civilization. - Jack London

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

Their highest concept of right conduct, in his case, was to get a job. That was their first word and their last. It constituted their whole lexicon of ideas. Get a job! Go to work! Poor, stupid slaves, he thought, while his sister talked. Small wonder the world belonged to the strong. The slaves were obsessed by their own slavery. A job was to them a golden fetich before which they fell down and worshipped.

...his ardors and toils were in themselves self-remunerative. They were expressions of life, and life is always happy when it is expressing itself.