In Victor Hugo's "Les Miserables," the quote reflects a profound understanding of love and human suffering. It suggests that true happiness can exist even amidst turmoil and misfortune. The ability to perceive the duality of light and shadow in life is presented as essential for grasping the complexities of existence and the human heart.

The quote emphasizes that those who cannot recognize both joy and sorrow are blind to the essence of truth. A soul worthy of love is one rich with experience, including pain and adversity. This dual perspective shapes a deeper understanding of humanity, illustrating that love and suffering can coexist and that such awareness is key to a meaningful life.