Themes in John Steinbeck's The Pearl. I need to know the most important ones.

I think the most
important theme in is Obsession.

In Chapter II, Kino dives for pearls in a desperate attempt to find one of value with
which to pay the doctor to treat Coyotito for the scorpion sting that could kill him. Instead,
Coyotitos condition improves, the result of Juanas treating his wound with an old remedy, and
Kino finds not just a valuable pearl but the Pearl of the World. With these two events, Kinos
life changes dramatically. In the magnificence of the huge, perfect pearl, Kino envisions a
future unlike any he had ever dared to imagine; looking into the glowing surface of the pearl,
he sees dreams formnew clothes for his family, his and Juanas wedding in the church, a harpoon
and a rifle for himself, and most of all, an education for Coyotito. Kinos contentment with the
Song of the Family is now lost in the music of the pearl that sings with triumph in
him.
 
Becoming a rich man changes Kinos life immediately in ways he does not
anticipate as shadowy figures attempt to steal the pearl. He is attacked, his home is invaded,
and he kills a man in self-defense when he is attacked a second time. When Juana tries to throw
the pearl back into the sea, believing that it is evil and will destroy them, Kino beats her
with animal savagery and then is sickened by what he has done to her. For Kino, possessing the
pearl with all its promises has become an obsession; he pursues it until his and Juanas old life
is destroyed and their baby is dead.
 
Despite the initial death and
destruction the pearl brings into his and Juanas life, Kino will not give it up. Rather than
sell it to the corrupt pearl buyers for essentially nothing, he chooses to defy the system and
sell it in the capital for a fair price; after his house has been burned and his canoe
destroyed, he still refuses to sell the pearl in La Paz. This pearl has become my soul, Kino
says. If I give it up I shall lose my soul. Leaving the old life behind, he takes Juana and
Coyotito on a journey to the capital, leaving the trail and fleeing into the mountains when they
are tracked by three men who will kill them for the pearl. Kino prevails over the trackers,
killing them all, but his obsession with the pearl ends only when he realizes Coyotito has died,
the innocent victim of a rifle shot. Returning to the village with Juana by his side, Kino
throws the pearl into the sea.