C.S. Lewis asserts that true friendship requires a shared interest beyond mere companionship. He emphasizes that friends must have a common ground or enthusiasm to bond over; otherwise, their relationship cannot deepen into true friendship, even if they feel affection for one another. Without a mutual interest or something meaningful to engage with, individuals cannot truly connect as friends.

Lewis suggests that friendships are enriched by shared experiences or passions. If two people lack a mutual pursuit or haven’t a shared destination in life, they cannot engage in the journey of friendship meaningfully. In essence, having friends is contingent upon desiring something greater together, underscoring the importance of common interests in forging deep connections.