The lyrics of the song "Sealed With A Kiss," recorded and released in 1989 by Australian singer Jason Donovan, tell a story about a couple who must say goodbye for the summer. The singer promises his loved one that, despite the distance, he will continue to express his affection by sending her letters filled with his love and dreams. The lyrics are packed with emotional themes about love, longing, and separation.

In the first verse, the singer expresses how despite having to say goodbye to his love, he will always send his love to her through letters. He assures her that he will make sure every letter contains his love and affection. The second verse implies that the summer will be a cold and lonely one, showcasing how the singer feels deeply about being far away from his love. Despite everything, he promises to keep sending letters with his dreams to keep their love alive. The bridge expresses the difficulty of the separation and how the singer will long to hear his love's voice and hold her despite knowing it's impossible.

The final verse expresses the singer's wish to make a pledge with his love to meet again in September. The pledge seals their love with a kiss, and he promises to keep sending those letters until they meet again. The song is emotionally stirring and conveys the power of love over distance and the importance of keeping a promise to a loved one.