Why does God seem different in the Old and New Testaments?

Question 02061

Many readers come away feeling that God seems different in the Old and New Testaments, as though a fierce and thundering deity of judgement gives way to a gentle God of love when we turn the page to Matthew. This impression is common, and it is worth taking seriously, but it does not survive a careful reading of the Old and New Testaments together. The same God, with the same character, stands behind both, and the apparent difference says more about our selective reading than about any change in Him.

To see why, we need to look at what Scripture says about God’s unchanging nature, and then to test the popular caricature against what the Old and New Testaments actually contain.

The God who does not change

The Bible is emphatic that God does not change. He declares through Malachi, I the LORD do not change, and James says there is no variation or shadow due to change in the Father of lights. The writer to the Hebrews insists that Jesus is the same yesterday, today, and for ever. Whatever we make of the differences in tone we feel across the Old and New Testaments, we are not free to conclude that God Himself grew or mellowed or had a change of heart. His character is fixed, and that fixedness is our security, as the question of divine immutability draws out.

This means the burden of proof lies the other way. If God cannot change, then any sense that He is different in the Old and New Testaments must arise either from a misreading of one testament or the other, or from the genuine progress of God revealing more of Himself over time. Both of those turn out to be at work.

Grace and judgement across the Old and New Testaments

The caricature collapses the moment we actually read widely in the Old and New Testaments. The God of the Old Testament is overflowing with mercy. He proclaims His own name to Moses as the LORD, merciful and gracious, slow to anger, abounding in steadfast love and faithfulness. He spares Nineveh, He pleads with wayward Israel, He carries His people like a father carrying his child. The patience and tenderness of God fill the older Scriptures from end to end.

Equally, the God of the New Testament is no stranger to judgement. Jesus speaks of hell more than anyone else in Scripture. Ananias and Sapphira fall dead for lying to the Spirit. The book of Revelation is heavy with the outpoured wrath of God on a rebellious world. The cross itself is the most severe display of divine judgement anywhere in the Bible, the place where the wrath of God fell in full on His own Son. Read honestly, the Old and New Testaments show the same God who is both perfectly loving and perfectly just, and the link between those is taken up in the question of whether God’s wrath is compatible with His love.

Why the tone can feel different

If God is the same, why does the feeling of difference persist? Part of the answer is that the Old and New Testaments are telling different stages of one unfolding story. The Old Testament largely records God’s dealings with one nation, Israel, under a covenant with national blessings and national curses, so its pages carry many accounts of national judgement that belong to that setting. The New Testament unfolds the age of the gospel going out to all peoples, so its dominant note is the offer of mercy in Jesus before the judgement still to come.

Another part of the answer is progressive revelation. God did not tell us everything about Himself at once. He revealed His character step by step across the Old and New Testaments, and the fullest revelation comes in the face of Jesus, who is the exact imprint of God’s nature. We do not see a different God in Jesus. We see the same God shown more clearly and more fully than ever before, which is why the question of how people in the Old Testament were saved helps round out the picture.

Answering the ancient error

This is not a new question. In the early church a teacher named Marcion concluded that the harsh God of the Old Testament and the loving God of the New could not be the same being, and he tried to cut the Old Testament out of the Bible altogether. The church rightly condemned this as heresy, because it tore apart the unity of God’s revelation and left believers with a mutilated Bible and a divided God. The same instinct survives today wherever people set the Old and New Testaments against each other.

The Christian answer then and now is that there is one God, one story, and one consistent character running through the whole of Scripture. The Old and New Testaments are not two rival portraits but one growing portrait of the God who is from everlasting to everlasting, holy and loving in equal and unchanging measure.

The fullest picture comes in Jesus

If we want to settle the question of whether God is different in the Old and New Testaments, the surest place to look is Jesus. The New Testament says He is the exact imprint of God’s nature, so that whoever has seen Him has seen the Father. Jesus does not show us a softer God who has replaced an older, sterner one. He shows us the very God who spoke at Sinai, now made visible in human flesh, full of grace and truth together.

Seen in this light, the wrath and the mercy that run through the Old and New Testaments meet perfectly at the cross. There the justice that the Old Testament took so seriously and the love that the New Testament proclaims are displayed at the same moment, as God judges sin fully in His Son while saving sinners freely. The cross is the clearest proof that we are dealing with one God whose holiness and love have never been at odds.

Reading the Old and New Testaments as one book

Much of the felt difference between the Old and New Testaments fades when we stop reading them in isolation. The Old Testament is not finished until the New completes it, and the New cannot be understood without the Old that prepares for it. They are two acts of a single drama, written by one Author who reveals Himself steadily from the first page to the last.

When believers learn to read the Old and New Testaments together, the supposed two faces of God resolve into one face. The promises made in the older Scriptures are kept in the newer, and the character glimpsed in shadow becomes plain in the light of Jesus. The unity of the book reflects the unity of its God.

Why reading the testaments rightly matters

Getting this question right is not an academic exercise. If we come to believe that God is genuinely different in the Old and New Testaments, we will end up trusting Him less, never quite sure which version of God we are dealing with on a given day. A divided picture of God breeds a divided heart in the worshipper.

But when we see one consistent God across the Old and New Testaments, our confidence rests on solid ground. The God who kept His ancient promises to Israel is the same God who has promised to keep us, and the love that reached its height at the cross is the love that has always burned at the centre of His being. A unified God gives the believer a settled and restful trust.

The believer who reads the Old and New Testaments as one continuous revelation gains far more than tidy theology. He gains a God he can lean his whole weight upon, the same yesterday and today and for ever, whose every word across the long centuries of the Old and New Testaments can be trusted without reserve or fear.

So, now what?

When you next feel the jolt of God seeming different in the Old and New Testaments, slow down and read more widely before you draw a conclusion. Look for the mercy that floods the Old Testament and the judgement that runs through the New, and you will find the caricature dissolving in your hands. The God of Sinai and the God of Calvary are one.

Let this also steady your trust. Because God does not change across the Old and New Testaments, the promises He made of old are as reliable as the day they were spoken, and the love shown at the cross is the same love that has always beaten in the heart of God. You are dealing with a God whose character you can count on for ever.

“For I the LORD do not change; therefore you, O children of Jacob, are not consumed.” Malachi 3:6