The document discusses how making good choices, even if they are costly, can help build character. The author recounts befriending a lonely classmate in 6th grade despite their friends complaining. However, the friendship ended when the classmate betrayed the author's trust by sharing secrets with popular girls so they would befriend her. While it was painful, the author does not regret the choice and believes it taught valuable lessons about trust and people's motivations for popularity. Overall, costly good choices provide character-building experiences and lessons that help personal growth.