" Truth is the best shield and safeguard against an array of modern and postmodern objections to Christian faith. Many Christians have skipped over the question of truth, often unwittingly, and they cover its absence with all sorts of genuine but inadequate answers. They believe in God because faith “works for them” or “the family that prays together stays together” and so on. Such faith may be sincere, but it will always be vulnerable. From one side it will be open to doubt, and from the other it will be open to all the accusations of modern skepticism—that faith is only “bad faith,” believed for reasons other than that it is true, and that it fears to face the challenges surrounding truth. There has to be a moment when, as Chesterton puts it, he and millions of Christians with him believe in the Christian faith because the key “fits the lock, because it is like life.” “We are Christians,” he continues, “not because we worship a key, but because we have passed a door; and felt a wind that is the trumpet of liberty blow over the land of the living.”25 "

― Os Guinness , Fool's Talk: Recovering the Art of Christian Persuasion