In "The Last Unicorn" by Peter S. Beagle, the speaker expresses a profound sentiment about the relationship between joy and sorrow. They acknowledge that as long as there is joy in their life, sorrow cannot take root. This highlights a powerful theme of hope and resilience, suggesting that happiness has the ability to overshadow grief. The acknowledgment of one specific sorrow indicates that while joy can prevail, some feelings remain inescapable, hinting at the complexities of human emotions.

This quote emphasizes the intertwining of joy and sorrow, where the experience of joy becomes a source of strength. It reflects a gratefulness for the joy that exists, and by thanking someone for that joy, the speaker acknowledges the role that connections with others play in enhancing one’s happiness. Ultimately, this passage captures the essence of navigating through life's ups and downs, celebrating the joy that endures despite the presence of sorrow.