"I believe in the forgiveness of sins." This follows the section about the Holy Spirit, the Church, and the communion of the saints.
Forgiveness is something the Lord gives freely to his loved ones. Truly, the Lord is the only being who has a right to remain angry at his people for committing treason against him but he does not. He sent Jesus to freely forgive us.
It is freeing to know that my sins are forgiven. It is difficult to forgive other people, but this is another work that the Holy Spirit does in his children. He forgives sins through us.
It's even harder to teach children to forgive. Children are best at showing their natural depravities. They kick each other, get mad, use each other, and will always blame others for whatever is wrong in their lives. How do we teach them both forgiveness and loving others more than themselves? Only the Holy Spirit can really do that, and only he can help us set the example.