The quote emphasizes that our ability to create positive memories plays a crucial role in overcoming negative experiences. While bad memories can linger and serve as reminders to keep us safe, the joyful moments in life have the power to mitigate their impact. The 'mercy in our making' refers to our inherent capacity for kindness and resilience, which fosters hope and encourages personal growth. This highlights the importance of nurturing positive thoughts and experiences, as they are essential for our emotional survival. Ultimately, the quote reminds us that focusing on light and grace can help us navigate through darkness, leading to a more fulfilling life.