What is the main conflict in Running from Safety: An Adventure of the Spirit by Richard Bach?

Running from Safety: An Adventure of the Spirit by Richard Bach is a philosophical book that offers insight into religion, the meaning of life and facing one's fears. Richard is a writer who frequently has angels showing up to teach him lessons in life. One day, he meets an angel who reminds him of a promise he made to himself when he was nine. He had promised himself that he would come back in 50 years to teach the boy about all he had learned in life.