How is the theme of untamed ambition shown in The Pearl?

Untamed ambition is one of the main themes in John Steinbeck's The Pearl, and it destroys the lives of the main characters. Greed and ambition are evident in almost every character, first seen in the greedy doctor who refuses to treat Kino’s son after he is stung by a scorpion. This theme will continue throughout the story—people’s greed will either make them rude and uncaring, leading them to take advantage of others, or will tear them apart because they sacrifice important things to gain more wealth.
Kino, after he finds the pearl, becomes extremely ambitious, trying to sell it for the highest price possible. He begins to argue constantly with his wife, who was content in their life beforehand. People try to scam Kino and purchase the pearl for extremely low prices, and a thief attempts to break in and steal it from Kino’s house. This ambition eventually leads to a rampage of violence and the death of Kino’s young son.