This heartfelt ballad explores themes of love, longing, and dependence. The singer uses the metaphor of a passport to express how essential his partner is to him - just like a passport is needed for travel, he needs her to navigate through life. He feels lost and incomplete without her by his side, emphasizing her significance in his life. The line "keep the light on" symbolizes hope and reassurance; he wants her to wait for him and keep their love alive despite the distance between them. The song reveals a deep vulnerability as he admits that without her, he can't go on, suggesting an intense emotional reliance on his partner.
