Well, a painful story can also provide a unique perspective. Consider a person who has overcome an illness. They might have a different view on life and business. This different view can lead to innovative ideas. Also, the memories of pain can be a constant reminder of where they came from and how far they have traveled. It makes them appreciate their success more and strive to maintain it. For example, a singer who was once rejected many times but now uses those memories to fuel their performances and connect more deeply with their audience.
The painful story gives them motivation. For instance, if someone has been bullied in the past, they might be determined to prove themselves. This drive pushes them to work harder than others.