The song 'Later' by Cat Stevens is a heartfelt exploration of the passage of time and the emotional impact it has on relationships. A key theme in the song is the inevitability of change and how it affects the bonds between individuals. Stevens reflects on the moments of love, separation, and the bittersweet nature of memories. By pondering the past, he highlights the importance of cherishing moments with loved ones before it's too late. Poignant moments in the song often come from Stevens' introspective lyrics that evoke a sense of nostalgia and urgency, urging listeners to value every moment as if it were their last.