The Three Parts of Morality

Today's Scripture

Micah 6:8 — "He has told you, O man, what is good; and what does the Lord require of you but to do justice, and to love kindness, and to walk humbly with your God?"

Matthew 22:37-40 — "You shall love the Lord your God with all your heart and with all your soul and with all your mind. This is the great and first commandment. And a second is like it: You shall love your neighbor as yourself. On these two commandments depend all the Law and the Prophets."

The Big Idea

Ask most people what morality means and they will say something like "don't hurt other people." Lewis says that is only a third of the picture. Real morality has three parts: fair play between people, health inside each person, and a destination for human life as a whole. Skip any one of the three, and the other two eventually fall apart.

Reflection

A fleet of ships

Lewis opens Book III of Mere Christianity — the section called "Christian Behaviour" — with a picture. Imagine humanity as a fleet of ships sailing in formation. For the voyage to succeed, three things have to go right.

First, the ships must not crash into each other. Second, each ship must actually work — engines sound, steering true, no leaks below the waterline. Third, the fleet has to be going somewhere. A fleet of polite, well-maintained ships sailing in circles is still a failed voyage.

"Morality, then, seems to be concerned with three things. Firstly, with fair play and harmony between individuals. Secondly, with what might be called tidying up or harmonising the things inside each individual. Thirdly, with the general purpose of human life as a whole." — C.S. Lewis, Mere Christianity, Book III, Chapter 1

Lewis noticed that almost all modern moral talk stays on part one. We argue endlessly about how people treat each other — fairness, rights, harm. Those arguments matter. The Bible cares deeply about them too: Romans 13:10 — "Love does no wrong to a neighbor; therefore love is the fulfilling of the law."

But Lewis presses further:

"The human machine goes wrong in two ways. One is when human individuals drift apart from one another, or else collide with one another and do one another damage, by cheating or bullying. The other is when things go wrong inside the individual." — C.S. Lewis, Mere Christianity, Book III, Chapter 1

Collisions between ships, and breakdowns inside ships. You cannot fix the second kind with rules about the first kind. And here is the uncomfortable part: the collisions usually start with the breakdowns.

Traffic rules cannot fix engines

Think about your school or workplace. It can post all the rules it wants — no cheating, no gossip, no cutting in line. The rules might reduce collisions for a while. But no rule ever made anyone kind. A person full of envy will find a way to wound someone without technically breaking a single rule. You have probably watched it happen. You have probably done it.

Lewis puts it in one sentence:

"You cannot make men good by law: and without good men you cannot have a good society." — C.S. Lewis, Mere Christianity, Book III, Chapter 1

Jesus said the same thing to the religious experts of his day, and he said it more sharply. Matthew 23:25-26 — "Woe to you, scribes and Pharisees, hypocrites! For you clean the outside of the cup and the plate, but inside they are full of greed and self-indulgence. You blind Pharisee! First clean the inside of the cup and the plate, that the outside also may be clean." Outside polished, inside rotten. Jesus says the order matters: inside first.

That is why the Bible treats the heart — the control room of a person — as the thing to guard above everything else. Proverbs 4:23 — "Keep your heart with all vigilance, for from it flow the springs of life." What is inside does not stay inside. It flows out, the way a polluted spring poisons everything downstream.

Where is the fleet going?

Now the third part, the one almost nobody talks about. Suppose every ship is seaworthy and nobody crashes. One question remains: where is the fleet supposed to be sailing? If there is no destination, then "good course" and "bad course" mean nothing. You cannot be off course unless there is a course.

The Bible answers without hesitating. Ecclesiastes 12:13 — "The end of the matter; all has been heard. Fear God and keep his commandments, for this is the whole duty of man." And Paul makes the destination cover every square inch of an ordinary day: 1 Corinthians 10:31 — "So, whether you eat or drink, or whatever you do, do all to the glory of God." Even lunch is part of the voyage.

Why would God get to set the course? Because the fleet is his. Colossians 1:16 — "all things were created through him and for him." That little word "for" is the whole third part of morality. You were made for someone. A.W. Tozer argued that everything in your life tips one direction or another based on this:

"What comes into our minds when we think about God is the most important thing about us." — A.W. Tozer, The Knowledge of the Holy

That sounds extreme until you test it. What you believe the voyage is for quietly decides how you spend money, who you envy, what you fear, and what counts as a wasted life. J.I. Packer answers the destination question in two short lines:

"What were we made for? To know God. What aim should we set ourselves in life? To know God." — J.I. Packer, Knowing God

And Augustine — a man who spent his youth chasing every other destination first — wrote the most famous sentence ever composed about the restless human heart:

"You have made us for yourself, O Lord, and our heart is restless until it rests in you." — Augustine, Confessions

The ache you feel when you get the thing you wanted and it still is not enough? That is not a malfunction. That is the compass needle, swinging toward home.

Forever people

There is one more piece, and Lewis saves it for the end of the chapter because it changes the size of everything.

"Christianity asserts that every individual human being is going to live for ever, and this must be either true or false." — C.S. Lewis, Mere Christianity, Book III, Chapter 1

If we live seventy or eighty years and then blink out, then nations and movements — things that last centuries — matter more than individuals. But if Christianity is true, the math flips:

"If individuals live only seventy years, then a state, or a nation, or a civilisation, which may last for a thousand years, is more important than an individual. But if Christianity is true, then the individual is not only more important but incomparably more important, for he is everlasting and the life of a state or a civilisation, compared with his, is only a moment." — C.S. Lewis, Mere Christianity, Book III, Chapter 1

Lewis preached the same idea in The Weight of Glory, and it may be the most quoted thing he ever said:

"There are no ordinary people. You have never talked to a mere mortal. Nations, cultures, arts, civilisations — these are mortal, and their life is to ours as the life of a gnat. But it is immortals whom we joke with, work with, marry, snub, and exploit." — C.S. Lewis, The Weight of Glory

Now look back at Jesus's summary of the law in Matthew 22:37-40. Love God with all your heart, soul, and mind — that covers the inside of the ship and the destination. Love your neighbor as yourself — that covers the fleet. Micah 6:8 had already sketched the same three-part shape centuries earlier: do justice (between), love kindness (inside), walk humbly with your God (above).

So here is the honest question: how is your voyage going? Most of us must admit we have rammed other ships, our engine room is a mess, and we have spent whole years sailing toward harbors that do not exist. The three parts of morality are not three ways to feel successful. They are three ways to discover we are sinking.

This is where the gospel — the Bible's word for good news — comes in. Jesus is the one human being whose ship sailed true in all three ways: he never wronged a neighbor, his inner life was clean to the bottom, and he aimed his whole existence at his Father's glory. And at the cross he traded records with us — he took the shipwreck we earned and gives us the voyage he completed. Christianity does not begin with "sail better." It begins with a rescue at sea. Only after we are pulled from the water does God begin rebuilding the engine, patching the hull, and turning our ship toward home — toward himself, where the restless heart finally rests.

Going Deeper

Run Lewis's three-part diagnostic on yourself today, on paper. Three lines: Between — is there a person I am cheating, avoiding, or wounding? Inside — what is the state of my engine room: envy, lust, anxiety, resentment? Above — what am I actually sailing toward this month? Write one honest sentence for each. Then take the worst line, and instead of resolving to do better, bring it to God: "This is where I'm sinking. Thank you that Jesus sailed this part perfectly for me. Start your repairs here."