What is the greatest commandment?
The short answer
When Jesus was asked which commandment is the greatest, he gave a twofold answer: love God with your whole heart, soul, mind, and strength — and love your neighbour as yourself. He said the entire law and the prophets hang on these two, so they're not just a rule among many but the heart from which every other commandment grows.
Full explanation
A scholar once tried to test Jesus by asking him to rank the commandments — expecting, perhaps, a debate over fine points of the Law. Jesus answered with striking clarity. He reached back to the ancient prayer every faithful Jew knew by heart — "Hear, O Israel… you shall love the Lord your God" — and named that as the first and greatest. Then, without being asked, he added a second and bound it tightly to the first: love your neighbour as yourself. Together these are the greatest commandment, and the genius of Jesus' answer is that he refuses to let us separate them.
A useful image is a tree. The two great commandments are the trunk; all the other commandments are branches. The branches are real and necessary, but they draw their life from the trunk and make no sense apart from it. "Do not steal," "do not lie," "honour your parents" — every one of them is simply love of God or love of neighbour taking a specific, concrete shape. This is what Jesus means when he says the whole law "hangs on" these two: he's not abolishing the other commandments; he's revealing what they were always for. They are love spelled out in detail.
The order matters, too. Love of God comes first, because he is the source of all love and the only one who can be loved with literally everything we are. We don't generate this love from scratch; we receive it. God loves us first, and our love for him is the answering response — like an echo returning to its source. Loving God with heart, soul, mind, and strength means no compartment of life is left out: not just feelings, but thoughts, decisions, work, and body. It's a love meant to gather the whole self.
But Jesus won't let that first love float free of the second. The two commandments are like a rope of two strands twisted together — pull them apart and the whole thing unravels. Scripture says it bluntly: anyone who claims to love God while hating his neighbour is a liar, because you can't love the unseen God while despising his visible image standing in front of you. Love of neighbour is the proof and the practice of love of God; love of God is the root and the fuel of love of neighbour. Each guards the other from going wrong — love of God keeps love of neighbour from collapsing into mere sentimentality, and love of neighbour keeps love of God from becoming empty piety.
This is why the whole moral life can be summed up in a single word: love. Not love as a fleeting feeling, but love as a deliberate willing of the good — for God and for every person God has placed in our path, including the ones we'd rather avoid. Everything else the Church teaches about how to live is, at bottom, an unfolding of how to love well.
Why this matters
If you forget the greatest commandment, Christianity quickly hardens into either rule-keeping without warmth or vague kindness without God. Keeping these two at the centre prevents both. It gives you a single question to bring to any decision: Is this love — for God, and for the people in front of me? And it sets the bar high in the best way: holiness isn't measured by how many rules you avoid breaking, but by how completely you love.
Myth Common misunderstanding
Some treat the command to love as the soft alternative to the "hard" rules — as if "just love" meant doing whatever feels affectionate and skipping the demanding commandments. But Jesus presents love as the source the other commandments flow from, not a replacement that cancels them. Real love of neighbour will still refuse to steal from them, lie to them, or use them. "Love" doesn't lower the standard; it explains and raises it.
Scripture connections
- Matthew 22:36-40 — Jesus names the twofold love of God and neighbour as the greatest commandment and says all the law and prophets depend on it.
- Deuteronomy 6:4-5 — the Shema, "love the Lord your God with all your heart," which Jesus quotes as the first commandment.
- Leviticus 19:18 — "love your neighbour as yourself," the second commandment Jesus binds inseparably to the first.
- 1 John 4:20-21 — the test that love of God is false if it coexists with hatred of one's neighbour.
Church teaching references
Reflect
If every commandment is just love taking a specific shape, which "branch" of your life right now most needs to be reconnected to the trunk of loving God and neighbour?