The Practical Conclusion

Big idea

Summary

Lewis argues that in Christ, the next step beyond ordinary humanity has already occurred, and this new life is now meant to be shared with believers, not merely admired or imitated. He compares receiving it to how natural life is passed on through birth -- an odd, given process we do not invent but simply accept -- and names three ordinary channels Christian tradition points to for spreading this new life: baptism, belief, and the sacrament of Communion, while acknowledging that different Christian traditions weigh these three differently.

He defends accepting this claim 'on authority,' observing that almost everything we believe -- from the existence of distant cities to major historical events to basic science -- rests on trusting reliable testimony rather than personal proof, so relying on Christ's authority is not fundamentally different from the trust we extend everywhere else in life.

Lewis insists that receiving this new life is not a substitute for effort; like natural life, it must be nourished and can be neglected or lost. He describes it as more than intellectual assent -- Christians functioning as the actual 'body' through which Christ acts in the world -- which is why physical acts like baptism and Communion matter and not belief alone. He briefly acknowledges the unresolved question of people who never hear of Christ, urging that the right response is joining Christ's body to strengthen it for others' sake, not standing apart.

The chapter closes with an extended reflection on why God has not yet returned in open, undeniable force: he is deliberately delaying to give people a genuine chance to choose him freely, since once he appears without disguise, choosing will no longer be possible. Lewis compares that moment to an author suddenly walking onto the stage, which ends the play, and presses the reader that the present moment is the time for decision.

Key points

• The new life available in Christ is presented as a further step already begun in him, meant to be shared with believers.
• Baptism, belief, and Communion are named as the ordinary means through which this new life spreads.
• Believing 'on authority' is shown to be reasonable, since nearly all human knowledge rests on trusting reliable witnesses.
• Receiving new life in Christ still requires ongoing effort to nourish and protect it, much like natural life.
• Christians are described as forming Christ's actual 'body' in the world, not merely people who admire his teaching.
• God delays his final, undisguised return so that people retain a real chance to choose him freely while choice is still possible.

Illustrations & analogies

• Lewis compares the mysterious way natural life is passed on through birth to the equally mysterious way the Christ-life is passed on through baptism, belief, and Communion.
• He likens accepting Christian claims 'on authority' to believing in the existence of New York or the Norman Conquest -- trust in reliable testimony everyone relies on constantly.
• The image of sunlight making a greenhouse roof bright illustrates that God does not love people because they are good, but makes them good because he loves them.
• Lewis compares God's final, undisguised return to an author suddenly walking onto the stage -- an act that ends the play and the time for choosing sides.

Notable lines

He does not think God will love us because we are good, but that God will make us good because He loves us

C. S. Lewis Book II, Ch. 5 — The Practical Conclusion

When the author walks on to the stage the play is over.

C. S. Lewis Book II, Ch. 5 — The Practical Conclusion

Now, today, this moment, is our chance to choose the right side.

C. S. Lewis Book II, Ch. 5 — The Practical Conclusion

For reflection and discussion

1. Lewis compares believing in Christ's promises to believing in a city you've never personally visited, since both rest on trusted testimony. How persuasive do you find that comparison?
2. What do you make of Lewis's claim that Christians form Christ's literal 'body' in the world, rather than simply holding ideas about him?
3. Why might God choose to delay a final, unmistakable appearance rather than resolving the world's brokenness immediately, according to Lewis?