The quote "I promise to love you forever - every single day of forever" expresses a deep and unwavering commitment to love someone endlessly. It conveys the idea of an eternal promise, emphasizing that this affection will not wane over time but will be renewed each day. The repetition of "forever" highlights the boundless nature of love, suggesting that true devotion transcends the limits of time.

This poignant affirmation comes from the book "Eclipse" by Stephenie Meyer, which is part of the popular Twilight series. The context of the quote relates to the intense romantic relationships depicted in the series, showcasing themes of love, commitment, and the challenges that come with enduring feelings. Through such declarations, the characters grapple with the complexities of their emotions, ultimately reinforcing the idea that love is a powerful, enduring force.