The article presents the author's reply to comments by Peter S. Williams about his article in favor of British writer C.S. Lewis' apologetical argument from desire (AFD). The author argues that the principle of credulity may not be true and Williams has clearly misunderstood it. According to the author, Williams' defense of the abductive version of the AFD does not convince, as the abductive argument seeks to show that God is the best explanation of Joy.