"It seldom happens that any felicity comes so pure as not to be tempered and allayed by some mixture of sorrow"

This quote by Miguel de Cervantes speaks with the idea that real joy is hardly ever experienced without some degree of sadness. It suggests that even in minutes of happiness, there is generally an aspect of grief that tempers and eases the felicity. This might be analyzed in a variety of ways. It might be seen as a tip to appreciate the great times, as they are often fleeting and can be overshadowed by sadness. It could likewise be seen as a pointer to be conscious of the tough times, as they can be a source of strength and development. Eventually, this quote talks to the concept that life is a balance of happiness and sadness, and that both are required for a complete and significant life.