The quote by Mark Twain suggests that grief is something that can be managed and dealt with on its own. However, to truly experience and appreciate the depth and richness of joy, it is important to share it with others. Joy is a powerful emotion that can be multiplied and amplified when it is shared, making it a more meaningful and fulfilling experience.
Twain implies that while grief is an individual process, joy is something that is enhanced and enriched through connections and relationships with others. Sharing our joys and celebrating them together allows us to experience them more fully and create lasting bonds with the people in our lives.