The quote "A well-used life brings a happy death" emphasizes the importance of living a fulfilling and meaningful life. It suggests that when one maximizes their potential and engages in passions, they can approach death with a sense of accomplishment and contentment. This idea resonates with many philosophies that advocate for living with purpose and seizing opportunities, ultimately leading to a peaceful end.

In Walter Isaacson's biography of Leonardo da Vinci, this principle is reflected in da Vinci's own life. He dedicated himself to a relentless pursuit of knowledge and creativity, illustrating how an enriched life can lead to inner peace. Isaacson's portrayal of da Vinci demonstrates that a life fully engaged with curiosity and exploration contributes to a serene acceptance of mortality.