The song 'Eternity' by the Jonas Brothers delves into themes of timeless love and commitment. The lyrics touch on the idea that true love transcends the bounds of time, suggesting that even in the face of challenges, their bond will last forever. The chorus emphasizes the everlasting nature of their affection, portraying a deep sense of dedication and hope for a future together. Key moments in the song include the poetic depiction of cherishing every moment spent with a loved one and the promise of enduring devotion, making it a heartfelt anthem about the power of enduring love.