C.S. Lewis reflects on the nature of friendship in his book, "The Four Loves." He argues that there is no obligation for individuals to form friendships, nor is there any inherent duty to befriend others. Such relationships, while cherished, are fundamentally not required for existence. They arise from personal choice rather than necessity.

Lewis emphasizes that friendship, like art and philosophy, lacks survival value but enriches life and provides meaning. It is a voluntary connection that enhances our experiences rather than a need dictated by survival. As he notes, the universe and all its facets, including friendship, are gifts that add depth to life's journey.