Johnnie Comes Back by James Taylor delves into themes of nostalgia, remorse, and reflection. The song narrates the return of a character named Johnnie, who seems to represent a past self or a person who has been through significant personal changes. The lyrics suggest an exploration of past mistakes, the passage of time, and the longing for redemption. Key poignant moments include lines that reflect on the transient nature of life and the desire for reconciliation and forgiveness, making it a deeply relatable and emotional tune.