In the novel "Dragonfly in Amber" by Diana Gabaldon, the character expresses deep emotional turmoil caused by his love for Claire. The quote reflects the intensity of his feelings, suggesting that his affection for her is both a source of joy and pain. It highlights the complexity of love, where longing can lead to heartbreak.

The phrase encapsulates the bittersweet nature of their relationship, as love can lead to both happiness and sorrow. The depth of this sentiment resonates throughout the story, showcasing the profound impact of love on individuals and their experiences, ultimately portraying love as a powerful, yet sometimes heartbreaking, force.