In this episode, Jeff and Danny begin Book 4, the last in Mere Christianity (and they get the episode number wrong yet again). They discuss: what it means to "put on Christ" (including the idea that a certain amount of "positive pretending" might be involved); how Christ working in us begins to turn our "pretending" into reality; how attempting to become like Christ helps us to realize quickly just how rotten we really are at our core; how "putting on Christ"--what we today typically call "discipleship"--really is the core of what it means to be a Christian; and how this process is both challenging and gradual.