Perhaps to strengthen their unity. If they understand his story, they can better work together as a group. His story might also inspire them in their own faith and evangelistic efforts.
He might be recounting his encounters with other religious leaders or groups. Paul had many interactions with both Jews and Gentiles in his efforts to promote Christianity. He could be explaining how these encounters shaped his understanding of the new faith and how he adjusted his approach to preaching depending on the audience.
Apostles tells a story of faith, sacrifice, and spiritual journey.
The Acts of the Apostles mainly tells the story of the early spread of Christianity and the activities of the apostles after Jesus' ascension.
He might tell his story to share his experiences with others.
Maybe he wants to share his experiences with others. He could have had some unique or interesting things happen to him that he thinks others can learn from.
Maybe he wants to share his unique experiences and lessons learned during his journey.
Perhaps Hamlet wants Horatio to be the one to spread the truth. Horatio is his trusted friend, and by having him tell the story, Hamlet ensures that the events will be accurately related, free from the misinterpretations that others might impose.
Maybe he wants to share his experiences and feelings with others.
Perhaps he wants to share his experiences as a form of catharsis. Telling his story could be a way for him to unload all the pent - up emotions and memories related to his homelessness. It could also be a way for him to make sense of his own life and situation.
He wants to pass on his wisdom. Through stories, he can share the lessons he has learned in life, like the importance of honesty or hard work.