If the whole universe has no meaning, we should never have found out that it has no meaning — just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be without meaning. Similarly, the fact that eyes exist suggests that light must exist. And the the fact that we have spiritual longings … the fact that we even have a meaningful category of thought and speech called spirituality … Suggests that there is some corresponding reality out there which we have the capacity to “sense”. That capacity would be called faith, and that reality, God.
C.S. Lewis, Mere Christianity (New York: Macmillan, 1943, p. 46)