If Lion didn't forgive Neal, it would have been the death of both of him. Neal would probably dig himself in a giant hole, with no escape, and would feel guilty for the rest of his life, imprisoning him. Lion would just get angrier, and he would start to take it out on people that he loves, which he eventually did. He would also become imprisoned.
lion wasn't happy with his life because of the incident, his state of mind is of his own doing. By not letting go, he clung unto that hate, and let it fuel him. By realizing this, he was able to let go and become happy.
The translation : Time has the power to heal all wounds, But the power of forgiveness is beyond time; Moving the rock that is in your heart, The spirit of light will raise you up. The answers are found already in your heart, And you have the power to move that rock; By changing yourself, others will change, Peace on earth will not be contained. Winter long gone, the spring has arrived, Awakened land is near at hand; Life has profound purpose, Just yield and enjoy the journey. Hearts are connected when hands touch hands, Boundaries were set by lower mind; Free the mind and soul becomes itself, You are touched by endless time. The second section really applies to Lion. He was so mad, but he knew that he had already forgiven him in the inside, and by forgiving him, he took the first step of helping Neal get over his drug addiction.
Forgiveness is the only way to rid yourself of bonds and become truly free. The stages of the man is able to represent many different situations, all relating to somehow being set free. For me, the wall represents Lion's anger and hatred for Neal. In different view however, the man could be seen as Neal being forgiven by Lion. The image is all about becoming free, freedom is an essential in life.
The greatest peacemaker of all is to Love your enemies. In this video, it shows that by forgiving, they got to move on together. Rather than fighting back the stick figure on the right chose to forgive and forget.
The story was about Lion's tragic back story of his family and his inability to forgive and move on. But near the end of the story he knows that the only way he can move on is to forgive his friend who was the source of his miseries in his mind. The quote emphasizes his need to forgive Neal to be able to move on. Through out the story he expresses need for revenge against Neal, but the best thing he can do is just to forgive him.