Keller writes, “What is the environment that liberates us if we confine ourselves to it, like water liberates the fish? Love. Love is the most liberating freedom-loss of all.” Tim Keller also quotes C. S. Lewis: “Love anything, and your heart will certainly be wrung and possibly broken. If you want to make sure of keeping it intact, you must give your heart to no one, not even to an animal. Wrap it carefully round with hobbies and little luxuries; avoid all entanglements … it will become unbreakable, impenetrable, irredeemable. The alternative to tragedy, or at least to the risk of tragedy is damnation” (Keller, The Reason for God, 47; C. S. Lewis, The Four Loves [Harcourt, 1960], 123, quoted in The Reason for God, 44)