
It’s been a while since I’ve read C.S. Lewis’s Mere Christianity. Believer or unbeliever, everyone should read it. In fact, it should be required reading in every school, if only for what it can teach about detecting truth and untruth.
My son, Harrison, started reading it recently. I gave it to him a long time ago. He finally took a chance on it. He admitted he wasn’t sure he’d like it at first. But before too long, he became engrossed. For me, it was an “I told you so” moment. I knew he’d appreciate it. He’s a thinker. He’s also a debater in search of capable opponents. While Dr. James Lindsay was with us a few weekends ago, he seemed to really enjoy Harrison’s company, insisting to me in private that he has a bright future ahead of him.
I don’t know if Harry has finished the book yet. I suppose I should ask. In the meantime, I intend to revisit it soon, too. I consider the volume a medicine of sorts. In the same way I need a few ibuprofen to endure a headache, I sometimes need an hour with a time-tested and clear-thinking observer like Lewis—just a few of Mere Christianity’s opening chapters—to interpret this world’s blaring noise. I need someone far smarter and more eloquent than I to make simple the fact that truth is immovable, no matter how loudly the world around me insists otherwise (Isaiah 40:8; John 14:6).
Looking back at what I just wrote, I took a moment to retrieve the volume. I flipped through it and landed on the following portion, which is one of many I have underlined in pencil:
“[The Law of Human Nature] certainly does not mean ‘what human beings, in fact, do,’ for as I said before, many of them do not obey this law at all, and none of them obey it completely. The law of gravity tells you what stones do if you drop them; but the Law of Human Nature tells you what human beings ought to do and do not. In other words, when you are dealing with humans, something else comes in above and beyond the actual facts.”
That short collection of sentences alone is a decent dosage. Lewis is preparing to show how truth is never waiting to be discovered by vote or consensus. It simply is, and it always has been (Psalm 119:89). And relative to it, somewhere beneath the static of this opinion and that alternate perspective, there remains a fixed point. By the phrase “what human beings ought to do and do not,” Lewis means there’s a discernible moral north that no amount of clever wordsmithing or philosophical opining can erase (Romans 1:18–20).
It might sound somewhat naïve to say, but I still struggle to understand how we, as a society, could be having the conversations we are at this moment—having to ask questions like, “What is a woman?” Believe it or not, there was actually a time when essential right and wrong, truth and untruth, were not up for debate. People may have differed in practice, but they shared the quiet assumption that a generation’s mood does not define what’s true and what isn’t.
But nowadays, subjectivity has eclipsed objectivity as the most virtuous approach. The thing is, even the Christians—people who supposedly herald the objective truth of Christ—fell for it (John 17:17; 2 Timothy 4:3–4).
Nowadays, we tell our kids that we want them to choose their own path, that we don’t want to force morality upon them, but rather that they discover their truest selves and a genuine love for the Faith. And so, we let them decide whether they even want to attend church (Hebrews 10:24–25). What’s more, we don’t dare restrict or monitor their friendship circles or express concern about the way they dress (1 Corinthians 15:33). We hand them mirrors instead of maps and call it guidance. And then, when they drift aimlessly away from Christ, ultimately folding under the world’s pressure and no longer able to discern right from wrong, we act surprised, as though confusion were not the inevitable harvest of our own parental cowardice.
In short, when we establish and exalt the subjective self and its personal truths as the beginning and ending of one’s moral compass, we should not wonder why that compass’s needle spins wildly, unable to find true north.
What I like about Lewis’s Mere Christianity is that, beneath the confusion brought on by our own failures, he makes clear that even as this is happening, a heartbeat remains, and then he points to its subtle pulse. For example, we get a sense for it when humanity still flinches at cruelty or shows admiration for courage. These are “conscience” things. And part of Lewis’s point is that while we might try to silence the human conscience, we’ll never be able to kill it. It’ll be there whispering, and the only way to avoid it is to pretend not to hear it.
Lewis goes on to explain that if morality were a matter of individual invention, such thinking would inevitably lead to murder, betrayal, and many other things being forbidden in some cultures but virtuous in others. And yet, not even the moral relativist can live as though that were true. I think we’re seeing this in real-time right now. I watched a video of an Antifa member screaming “Offense!” and calling for help after being thrown to the ground by federal agents. But this happened only after he’d thrown a massive brick at the same agents. I’ve heard college students shout for “justice for victims” while celebrating the killing of unborn children. I’ve watched public leaders condemn violence on the Tuesday before Charlie’s assassination, only to make excuses for it on the Wednesday afterward.
In the end, this tension betrays something deeper. And it’s simply that we know. Even when we deny it, we know. There is a law beneath the noise, written into our being. And even when we pretend otherwise, it remains.
Where does this knowledge come from? Not from textbooks. Not from governments. Not from culture. It existed before all these things. I gave a brief lesson in our Preschool a few Wednesdays ago. From my time there, I can assure you that even a child knows the difference between showing kindness and showing cruelty. I can assure you, the students knew it long before someone like me had to sit down and define it during circle time. This awareness lives deeper than instinct. It is a whisper from something else.
Christians know what that “something else” is. The Bible reveals that it’s God’s Law written on the human heart—the echo of the Creator’s own character within the creature (Romans 2:14–16). It’s why guilt for wrongdoing burns even inside unbelievers (John 16:8). It’s why repentance and reconciliation feel so good, almost like coming home, even for atheists (Luke 15:17–24). In other words, even when we don’t believe it, these sensations are proof that we’ve heard its voice.
But as I said before, the only way to get around it is to pretend we don’t hear it.
Admittedly, our age has grown clever in its deafness. Evil has become “necessary.” Good has become “oppressive.” Guilt is dismissed as a false construct, and repentance is described as emotional manipulation pushed by a cruel patriarchy. Now, we have an ever-growing generation of mindless nitwits running around shouting “Injustice!” about almost anything and everything, all the while incapable of actually defining it. But that’s because they were let loose to create their own standard of rightness apart from God and His objective standards. Maybe that’s the real tragedy of our time. They cannot escape the Law, but neither can they name its Giver. And yet, they will stand before Him at their last, just like everyone else, and they will do so according to His truth, not theirs.
I hope we can turn this around. Personally, I think one of the only ways to do it is for more to step up and invalidate the lies whenever and wherever they occur. I don’t think folks should necessarily go looking for such opportunities. I just think we should be ready to respond to lies in our everyday lives. If we find ourselves in a moment where the line between right and wrong, good and evil, is blurred, we should be ready to respond in a way that unblurs it (2 Timothy 2:25). If we just had more people willing to do that, things would likely get better.
But that will take courage, the kind that doesn’t necessarily shout louder, but instead, bows lower before truth’s sacredness than before anything else. Do we have that kind of courage? I don’t know. Some days I feel like we do. Others, not so much.
Either way, there’s one thing I do know, and it’s that objective truth does not belong to us. We belong to it (John 8:31–32). We did not invent it. We are not the authors of right and wrong. We are its witnesses and, at crucial moments along the way, its servants (Romans 12:1–2).
I suppose there’s something else I know, too. Big or small, every genuine tyranny in life exists in the spaces where fear of speaking the truth has taken root. If you are afraid to speak truth to lies, you are a loyal subject to lies, plain and simple.



