In "Don Quixote," Miguel de Cervantes delves into the themes of loneliness and longing through the poignant expression of a heart's happiness being deeply tied to the presence of others. The quote reflects on the sorrow and discontent experienced over centuries in the absence of companionship, suggesting that true joy is often intertwined with shared experiences and meaningful connections.

This sentiment underscores the profound impact of relationships on one's emotional well-being. The heart, representative of the human condition, finds itself yearning for the company of others, highlighting the importance of love and the connections that fill the void of sadness in life.