“If You Are the Son of God”

“You who destroy the temple and build it in three days, save Yourself! If You are the Son of God, come down from the cross” (Matthew 27:40).

“If You are the Son of God…” Those words echo through the ages. They ring out not merely as a taunt from unbelieving voices at the foot of the cross; they also come as a direct challenge from Satan himself. If fact, we’ve heard these words before way back in the beginning of Matthew’s Gospel.

The Wilderness Temptation and the Voice of Satan

At the very beginning of Jesus’ public ministry—after His Baptism in the Jordan—the Holy Spirit led Him into the wilderness, where He was tempted by the devil. There, Jesus fasted forty days and forty nights, and when He was hungry, the tempter came: “If You are the Son of God, throw Yourself down” (Matthew 4:6).

In both cases, Satan sought to lure Jesus away from the path of trust in God, just like he did with Adam and Eve. He offered shortcuts—bread instead of fasting, a spectacle instead of faithfulness, and power instead of patience. And Jesus refused. He resisted every temptation, not by showing divine power, but by clinging to the Word of God. What Adam failed to do for his bride in the garden, Jesus accomplishes for His Bride, the Church, in the desert.

But Luke gives us this haunting detail at the end of the account: “Now when the devil had ended every temptation, he departed from Him until an opportune time” (Luke 4:13). And now here, at the foot of the cross, we see it: the opportune time. Satan returns—not directly, but through the voices of the mocking crowd. He returns through the religious leaders, the soldiers, even the criminals crucified with Jesus. Through them, he says again, “If You are the Son of God, come down from the cross.”

The Law’s Demand for Proof

This is the way of the Law. It demands visible proof; it requires evidence. “Show us who You are. Show us Your worth. Save Yourself! Prove it!” And on the surface, the temptation seems reasonable. After all, didn’t Jesus save others? Didn’t He heal the sick, raise the dead, exorcise demons, and feed multitudes? Surely, He can save Himself! If He truly is the Son of God, shouldn’t He demonstrate it by avoiding death?

The Law always demands strength. “Do this and live.” The Law has no patience for weakness; it has no mercy for those who suffer. It says, “If you really are who you say you are, prove it by what you do.” And that voice isn’t just heard at Calvary; it’s also heard in our own hearts. It’s the voice that whispers in the dark when you feel your failures:

“If you are a Christian, why do you still struggle with sin?”

“If God really loves you, why are you suffering?”

“If you are a child of God, why don’t you feel strong and victorious?”

The Law always turns us inward; it makes us look at ourselves for proof of God’s love. And what do we find? We find weakness, doubt, shame, sin, guilt, and suffering. The Law accuses; it leaves us naked and afraid. But Jesus does not answer the Law’s demand.

Twelve Legions of Angels—But No Rescue

Remember what Jesus said to Peter during His arrest? “Do you think that I cannot now pray to My Father, and He will provide Me with more than twelve legions of angels?” (Matthew 26:53). A Roman legion was about 6,000 soldiers, so twelve legions would be roughly 72,000 angels. And Jesus says over 12 legions! That is an overwhelming force—Heaven’s armies at the ready. With a mere word, Jesus could have stopped the arrest, halted His scourging, and come down from the cross.

But He doesn’t. He refuses the rescue. He refuses the proof.

Why?

Because His mission was not to save Himself, but to save you. If Jesus had come down from the cross, the Law would would not have been fulfilled, for it requires death; and the Gospel would have been lost. You and I would still be in our sins. The power of Hell would remain unbroken. But instead, the Son of God stayed on the cross—not because He couldn’t come down, but because He wouldn’t dare.

This is what true Sonship looks like—not displays of power, but steadfast obedience. Not dazzling miracles, but quiet suffering. Not rescuing Himself, but redeeming others.

The Gospel in the Cross

This is the Gospel: Jesus refused to save Himself so that He could save you. He took the full weight of the Law’s demands upon Himself—the curse, the punishment, and the wrath. He became the Cursed One. “Cursed is everyone who hangs on a tree” (Galatians 3:13; cf. Deuteronomy 21:23). He bore that curse for you. He took your place. He drank the cup of God’s wrath to the dregs. And when He cried out, “My God, My God, why have You forsaken Me?” (Matthew 27:46), He cried out the Law’s verdict so that you might hear God’s verdict in the Gospel: “I forgive you all your sins.”

The Gospel is not “Jesus came down from the cross and showed His power.” The Gospel is: He stayed. He bore the shame. He endured the mocking. He suffered the silence of Heaven and His Father for you. And because of His perfect obedience, He imputes His righteousness to you (Romans 4:13-25; 2 Corinthians 5:21).

You don’t have to prove yourself. You don’t have to pass the Law’s test. You don’t have to answer the devil’s accusations. Jesus has answered them for you—with His blood.

Living as Sons and Daughters of God

When the world mocks your faith, when your own heart accuses you, when Satan tempts you with “If you are a child of God…”—remember the cross. Being a child of God does not mean always feeling strong or victorious. It means trusting your Father even in weakness. It means taking up your cross (and sometimes, we need our own Simon of Cyrene to help us bear it). It means walking the path Jesus walked—not to earn salvation, but because you already have it.

You are baptized into Christ’s death and resurrection (Romans 6:3-6). Therefore, you are not defined by your failures, your suffering, or your sin. You are defined by the faithfulness, love, and victory of Christ. You are God’s beloved child, for the Son of God did not come down from the cross. Sing the hymn with me:

God’s own child, I gladly say it:
I am baptized into Christ!
He, because I could not pay it,
Gave my full redemption price.
Do I need earth’s treasures many?
I have one worth more than any
That brought me salvation free
Lasting to eternity!

Sin, disturbing my soul no longer:
I am baptized into Christ!
I have comfort even stronger:
Jesus’ cleansing sacrifice.
Should a guilty conscience seize me
Since my Baptism did release me
In a dear forgiving flood,
Sprinkling me with Jesus’ blood?

Satan, hear this proclamation:
I am baptized into Christ!
Drop your ugly accusation,
I am not so soon enticed.
Now that to the font I’ve traveled,
All your might has come unraveled,
And, against your tyranny,
God, my Lord, unites with me!

Death, you cannot end my gladness:
I am baptized into Christ!
When I die, I leave all sadness
To inherit paradise!
Though I lie in dust and ashes
Faith’s assurance brightly flashes:
Baptism has the strength divine
To make life immortal mine.

There is nothing worth comparing
To this lifelong comfort sure!
Open eyed my grave is staring:
Even there I’ll sleep secure.
Though my flesh awaits its raising,
Still my soul continues praising:
I am baptized into Christ;
I’m a child of paradise!

LSB #594, God’s Own Child, I Gladly Say It

When you say you’ve been baptized into Christ, you’re also saying, “I’ve been crucified and risen with Christ!”

Conclusion

The devil said, “If You are the Son of God, come down.”

Jesus said nothing.

He stayed.

And by staying, He proved He is the Son of God—not because He saved Himself, but because He saved you. “In this the love of God was manifested toward us, that God has sent His only-begotten Son into the world, that we might live through Him” (1 John 4:9).

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