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WEEK 15 · WHAT THE LAW IS FOR

The mirror and the Savior

God’s law shows us who he is, who we are, and who we need.

◷ 8–10 minutes together♡ Ages 8–10

01 · GATHER ROUND

Start with a question.

“Have you ever had something on your face—like toothpaste or spaghetti sauce—and no one told you?”

Let the embarrassing stories flow. Everyone has one!

02 · OUR BIG QUESTION

Since no one can keep the law, what is its purpose?

That we may know the holy nature and will of God, and the sinful nature and disobedience of our hearts; and thus our need of a Savior.

New City Catechism · Question 15 · Children’s answer · Official page ↗

03 · OPEN THE BIBLE

Romans 3:20

Therefore no one will be justified in His sight by works of the law. For the law merely brings awareness of sin.

Berean Standard Bible · BSB

The Holy Bible, Berean Standard Bible, BSB is produced in cooperation with Bible Hub, Discovery Bible, OpenBible.com, and the Berean Bible Translation Committee. This text of God's Word has been dedicated to the public domain.

Read it slowly together. What words stand out? You can choose the translation your family knows best.

Toothpaste on your chin.

Imagine walking into school with a big blob of toothpaste on your chin. You have no idea it’s there. Then you pass a mirror in the hallway—yikes! Now you know. The mirror didn’t put the toothpaste there. It just showed you the truth.

But here’s the thing: you can’t clean your face with the mirror. Try rubbing a mirror on your chin. It won’t help! A mirror can show you the problem, but it can’t fix it. For that, you need water and a washcloth.

God’s law works like a mirror. Our Bible verse says the law brings awareness of sin. When we look at God’s commandments, we see two things clearly. First, we see what God is like—holy, good, true, and loving—and what he wants for us. Second, we see what we are like: people who don’t love God and others the way we should.

That’s why Paul says no one becomes right with God by keeping the law. Trying to fix our sin by following the rules harder is like trying to wash your face with a mirror. God’s law is good. It just can’t make us clean.

So what does the law do? It points us to someone who can. When we see how holy God is and how far we fall short, we realize we need a Savior. A Savior is someone who rescues you when you can’t rescue yourself. That’s Jesus. He is the one who washes us clean—not just a little, but all the way.

Seeing your sin can feel like a big uh-oh. Don’t look away from the mirror. Let it send you running to Jesus. He isn’t surprised by what you see, and he is ready to make you clean.

Big truth, little words:The law shows. Jesus saves.

04 · WONDER TOGETHER

Let’s talk about it.

  1. What does God’s law show us about God?
  2. Why can’t we become clean just by trying harder to keep the rules?
  3. How can seeing our sin actually be a gift?

Try answering one yourself first. “I don’t know yet” is a fine place to start a conversation.

05 · A LITTLE CHALLENGE

Carry the truth with you.

Put a sticky note on the bathroom mirror that says, “The law shows. Jesus saves.” Each morning when you brush your teeth, read it out loud and thank Jesus that he doesn’t just show us our mess—he cleans it up.

06 · TALK TO GOD

Let’s pray.

Holy God, thank you for your good law. It shows us how holy and good you are, and it shows us our sin. We can’t make ourselves clean, but you sent Jesus to be our Savior. Help us not to hide from the truth about ourselves. Help us run to Jesus every time we see how much we need him. Amen.

Then invite everyone to add one thing they want to tell God.

07 · MAKE IT STICK

A little truth to learn by heart.

Break the answer into three parts with motions. Point up for what the law shows us about God, point to your heart for what it shows about us, and reach out both hands for our need of a Savior. Say it in parts first, then all together.

SAY IT. HIDE IT. TRY IT TOGETHER.

This week’s answer · New City Catechism Q15

That we may know the holy nature and will of God, and the sinful nature and disobedience of our hearts; and thus our need of a Savior.

No streaks. No catching up. Just growing together.

Progress stays in this browser.
Made with care

Question 15 and its children’s answer are quoted from the official New City Catechism resource and were checked on September 29, 2026. The New City Catechism, Copyright © 2017 by The Gospel Coalition and Redeemer Presbyterian Church. Published by Crossway. Devotional, prayer, and activities are original. Scripture translations are supplied through YouVersion when connected. The saved BSB reading matches the official Berean Standard Bible text; the Berean text is dedicated to the public domain.