Exodus 34:14 (NKJV)

for you shall worship no other god, for the LORD, whose name is Jealous, is a jealous God.

Think of the last time you called someone jealous. You almost certainly did not mean it as a compliment. We use the word for the husband scrolling through his wife's phone, for the friend who cannot be glad when a rival is praised, for the quiet wanting of what belongs to someone else.

And so when we come to Scripture and find that one of God's own names is Jealous, it unsettles us. The word seems to say something troubling about His very character.

So whatever this jealousy is, it is not simply ours dressed up in holy clothes. In us jealousy is a fault; in God there is no fault to be found. He is not troubled by it. Nothing rises in Him and falls again the way a mood rises and falls in us. The question, then, is not whether God is jealous — but how the word we reserve for a sin can be one of the names of God.

Let's begin with a picture. A man discovers that his wife has been unfaithful, and he feels nothing. No grief, no anger. He shrugs. What do we make of him? We do not admire his calm; we sense that something is missing in him. A husband who can watch his marriage betrayed and stay unmoved never truly loved his wife to begin with. The capacity to be wounded is not the enemy of love but its evidence. A love that can lose everything and feel nothing was never really love.

So the word covers two very different things. One is envy that covets our neighbour's possessions, and this is a sin. But there is another kind: the refusal to give up on love. A wife's faithfulness belongs to her husband, and he does not sin by wanting it.

God's jealousy can be likened to this second kind. He does not envy, because everything that exists is already His. He is not insecure, because He alone has never had cause to be. When God is jealous He is not grasping after a love He has no claim to; He is guarding a love that is already His — His by right of creation, and His by right of redemption.

Scripture expresses this jealousy through the picture of marriage. God commands the prophet Hosea to take Gomer, a woman who will betray him, and to go on loving her through her unfaithfulness — a living portrait of the LORD's love for a faithless Israel.

Paul carries the same image into the New Testament:

2 Corinthians 11:2 (NKJV)

For I am jealous for you with godly jealousy. For I have betrothed you to one husband, that I may present you as a chaste virgin to Christ.

This is the jealousy the Bible describes: a husband's jealousy for the wife who is his by covenant. Picture the alternative — a husband who felt none of it, who watched his wife leave for another man and merely wished them well. We would not call him loving. We would call him a stranger to his own marriage.

In the end God is jealous for His own glory. This might sound like vanity to our minds. But in reality it is the very opposite. Vanity is a small creature demanding a glory it does not own. God demands only what is true. He is God, and there is no other.