P. 3 of Chapter 3 Kino has gotten overly devoted to the pearl since discovering it. This phrase implies that he became so attracted to the pearl that it became a part of him. This shows that even though Kino is a free-thinking nobleman, he is not immune to love.
Kino grows enraged at the prospect of not receiving the monetary compensation he believes he is due and chooses to retain the pearl. Kino gets infatuated with the pearl, and his life significantly changes. "This pearl has become my soul," Kino acknowledges, "and if I give it up, I will lose my soul" (87; ch. 15).
In the end, however, Kino realizes that the pearl is worthless and therefore cannot compensate him. Frightened by what will happen to him if he loses the pearl, Kino decides to return it to Ante.
Ante is happy to receive the pearl back and promises to help Kino find a way to get compensated for its loss.
Here we can see that the pearl has an important role in determining Kino's fate. If Kino had kept the pearl, he would have been able to secure his financial security. However, because he gives the pearl up, he is forced to live in poverty.
Furthermore, Ante's decision to help Kino compensate for the loss of the pearl shows that he has good intentions. He doesn't want to see Kino suffer needlessly due to his lack of wealth. Instead, he wants Kino to be able to pay off his debts so he can keep the pearl as a reminder of their agreement.
However, as Kino discovers the precious pearl, his entire life and personality are turned upside down. Kino loses his innocence when he understands the pearl will bring him nothing but difficulty, becoming more jaded and less trusting of others. When Moana seeks out Kino to ask for his help in returning home, she finds a very different man than the one who left her years ago.
Kino's transformation is so profound that by the end of the movie he has become an adult responsible for his own decisions, rather than a young boy controlled by his emotions. Although he still loves Moana with all his heart, he knows they can never be together because she belongs to another world. However, when she asks him to join her in her world after she is banished from her own, he accepts without hesitation.
During their trip across the ocean, Kino learns that friendship is stronger than love, and that family comes first. Once he realizes this, he grows up before our eyes as we see him take on his new responsibilities with confidence.
Also, it should be noted that Kino becomes friends with Tui, the son of Maui. Tui was once believed to be capable of becoming a great warrior like his father, until he made a mistake that caused him to lose his hand.