But I also know that to ignore joy while it lasts, in favor of lamenting one's fate, is a great crime.
The quote emphasizes the importance of embracing and appreciating joy when it occurs, rather than constantly dwelling on sorrow or misfortune. It suggests that recognizing and savoring happy moments is a vital part of life's experience, and neglecting this can be seen as a significant mistake.
The author encourages readers to value moments of happiness instead of letting them slip away unnoticed, which can lead to unnecessary suffering. Balancing acknowledgment of joy with awareness of life's challenges is essential for a fulfilling and meaningful existence.