In Mere Christianity , C.S. Lewis sought to reason his way to God’s existence by offering Christians his Argument from Desire. As he put it: Creatures are not born with desires unless satisfaction for these desires exists. A baby feels hunger; well, there is such a thing as food. A duckling wants to swim; well, there is such a thing as water. Men feel sexual desire; well, there is such a thing as sex. If I find in myself a desire which no experience in this world can satisfy, the most probable explanation is that I was made for another world. ( Mere Christianity , Bk. III, chap. 10, "Hope") Christian apologist Peter Kreeft explains that this argument can only be understood by first noting the difference between natural desires (for things like food, sex, and beauty) and artificial desires (for things like cars, political office, and the Land of Oz). [i] Kreeft also explains that “the natural desires come from within, from our nature, while (artificial desires) ...