In chapter 12 we again see Okonkwo's behavior show up again as he has another mishap. He feels as if he need to live up to his status of the strongest and fearless man ever. He can not be like his father. A bad father. A lazy waste. A failure. So his incident with Chielo happened. Now a little after that in the beginning of chapter 12 he shows his weakness side which is love and affection which Okonkwo's believes is every mans weakness. Well this notorious action that Okonkwo despise appears during this part of the story. Where enzima introduces himself and Okonkwo shows great interest for him. Chielo also helps contribute to this by making Okonkwo realize how much he needs to care for his own family. His wife. His children. They deserve it for putting up with his cruel behavior all their lives. This also may link to Okonkwo's rage and behavior. He kills his son!  That is outrageous. Just because he assumed that is the source of his weakness. Basing a killing of a theory is insane but Okonkwo is a man with his own rules and is not afraid of any consequences as long he doesn't end up like his fail of a father.