Much like Steinbeck's short novel The Pearl, Of Mice and Men is a parable that tries to explain what it means to be human. His friend Ed Ricketts shaped Steinbeck's thinking about man's place in the universe. Essentially, man is a very small part of a very large universe; in the greater scheme of things, individuals come and go and leave very little, lasting mark. Yet deep inside all people is a longing for a place in nature — the desire for the land, roots, and a place to call "home." The struggle for such a place is universal, and its success is uncertain.
In sharing his vision of what it means to be human, Steinbeck touches on several themes: the nature of dreams, the nature of loneliness, man's propensity for cruelty, powerlessness and economic injustices, and the uncertainty of the future.
