Paul McCartney's 'Only Love Remains' is a heartfelt ballad that delves into themes of enduring love, the passage of time, and the deep emotional connections that persist despite life's challenges. The song emphasizes the power and constancy of love as the ultimate force that remains when all else fades away. Key poignant moments include poignant reflections on past relationships and the hopeful message that true love will endure through any trials. The lyrics convey a sense of nostalgia and hope, underscoring the belief that love is the most important and lasting aspect of life.