Goodbye Stranger by Supertramp is a song about the transient nature of relationships and the inevitability of saying goodbye. The narrator reflects on past relationships with a sense of nostalgia and acceptance that those relationships were not meant to last. Key themes include transience, freedom, and the bittersweet nature of farewells. Poignant moments in the song include the repeated chorus lines 'Goodbye stranger, it's been nice / Hope you find your paradise,' which encapsulate the main sentiment of the song — a fond yet resolute farewell.