What's Really Inside Me?
Month 9: Guard Your Heart — Becoming Like Jesus · Heart Matters
Today's Scripture
Read together: Matthew 15:18–20 & Proverbs 4:24
18 But the things that come out of the mouth come from the heart, and these things defile a man. 19 For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, and slander. 20 These are what defile a man, but eating with unwashed hands does not defile him.” — Matthew 15:18-20
24 Put away deception from your mouth; keep your lips from perverse speech. — Proverbs 4:24
Memory Verse
“Guard your heart with all diligence, for from it flow springs of life.”— Proverbs 4:23 (BSB)
📖 Bible-in-a-Year (optional)
Today's reading: Ezekiel 24–26
Reading the whole Bible in a year — do this when you have extra time.The Heart of It
The people in Jesus' day worked very hard to look clean on the outside. They washed their hands just right. They followed all the rules others could see. But Jesus said something surprising. What really makes a person "dirty" doesn't come from the outside in. It comes from the inside out. "Those things which proceed out of the mouth come from the heart, and they defile a man" (). Think of the unkind word, the mean thought, the sneaky lie. None of those start in our hands or our mouths. They start in the heart, and then they come out. Proverbs says the same thing about the mouth. "Put away from you a deceitful mouth, And put perverse lips far from you" (4:24). But the cleanup has to begin deeper than the lips.
This is honest, and it's a little uncomfortable. The problem isn't only "out there" in bad influences. Some of it is in here, in me. That's why we can't fix ourselves just by trying harder to behave. A bucket only pours out what's already in it. But here's the grace. Jesus knows exactly what's inside us, and He still loves us. He came to do what we can't do. He came to give us a new heart. We'll see this all month long. So when something ugly comes out of us, we don't have to hide it or make excuses. We can bring it to Jesus. He's not surprised. He's the only One who can actually clean the inside.
Around the Table
Whatever is inside a cup is what spills out when it tips! A kind heart spills kind words.
Let's do it: Pretend to tip over a cup. What "spills out" of your heart? Kind words or grumpy ones? Let's ask Jesus for kind ones.
Mean words don't start in the mouth. They start in the heart. So if we want kinder words, we ask Jesus to work on our hearts.
Let's talk: When something unkind "spills out" of you, what does that tell you about what's inside?
Jesus aimed past our behavior, all the way to the source: the heart. We can't scrub ourselves clean from the outside. We need Him to change us within.
Let's go deeper: Where are you tempted to manage your outside and look good, while you ignore your inside? What would it look like to bring that to Jesus?
💬 Conversation Starter
Imagine a camera could record your thoughts for one hour today. Would they match the words you said out loud? Why is that worth thinking about?
🛡️ Defending the Faith
How do we know people really have a heart problem, and not just a learning problem? Nobody has to teach a toddler to be selfish or to lie. It comes out on its own, from the inside. Every culture in history has had to deal with the same wrongs in the human heart. What the Bible says is wrong with us matches what we see everywhere.
For Dad · Go Deeper
Behavior modification is the great temptation of parenting. We just want the outside to look right by bedtime. But Jesus relentlessly pushes past behavior to the heart, and so must we. This doesn't mean we ignore actions. It means we treat misbehavior as a window, not just a problem to suppress. When a child snaps at a sibling, the goal isn't only "stop it." It's also "what's going on in your heart?" To model this, let your own kids see you confess your heart-sins, not just correct theirs. A dad who says "Daddy was impatient because my heart wanted its own way. Will you forgive me?" preaches the gospel louder than any lecture. The heart we can't fix is exactly the heart Jesus came to make new.
Draws on: Paul Tripp, Parenting: 14 Gospel Principles.
Let's Pray Together
"Jesus, You see what's really inside us. And You love us still. We're sorry for the unkind things that come out of our hearts. Please make us new on the inside. Fill us up, so that good things spill out. In Jesus' name, amen."
The mouth just pours out what the heart is already holding. So let Jesus fill the heart.