What Is God’s Holiness?

Question 2041.

God’s holiness is the attribute Scripture reaches for more often than any other to describe who He is, and it means two things held together, that God is entirely set apart from His creation in majesty, and that He is entirely set apart from sin in moral perfection. When Isaiah is given a vision of the throne room in Isaiah 6, the seraphim do not call out that God is powerful three times, or loving three times. They cry “Holy, holy, holy is the Lord of hosts,” a triple repetition found nowhere else applied to any other attribute of God in Scripture, and that alone tells us something about how central this truth is.

I have noticed that god’s holiness is often the doctrine modern Christians feel least equipped to talk about, perhaps because our culture has largely lost the category of the sacred altogether. Yet without it, grace stops making sense, sin stops feeling serious, and worship collapses into mere sentiment. I want to recover a full, biblical picture of this attribute rather than a thin, sentimental one.

God’s holiness in Isaiah’s temple vision

Isaiah’s response to seeing this on display is not admiration but terror: “Woe is me! For I am lost; for I am a man of unclean lips” (Isaiah 6:5). That reaction is instructive. Genuine exposure to this attribute does not first produce comfortable feelings of closeness. It produces an accurate awareness of our own sin by contrast, the way switching on a bright light in a room reveals dust that was invisible in the dark. You can read the full vision at ESV.org.

The Hebrew word behind holy, qadosh, carries the root idea of separation, of being cut off from the common and the ordinary. Applied to God, it means He belongs to an entirely different category of being than anything else that exists, not simply a better version of creaturely goodness but goodness of a wholly different order.

God’s holiness and the Temple system

The entire structure of the Old Testament tabernacle and Temple, with its courts, its veils and its careful gradations of access, was a physical lesson in god’s holiness. Only the high priest could enter the Most Holy Place, only once a year, only with blood, and only after careful preparation (Leviticus 16). That elaborate system was not bureaucratic caution. It was a visible sermon about the seriousness of approaching a holy God as a sinner.

I find it remarkable how much of Leviticus, a book many Christians skip, is devoted to exactly this theme. God repeats the refrain “You shall be holy, for I the LORD your God am holy” (Leviticus 19:2) not as an arbitrary command but as the natural implication of belonging to a God whose very nature sets the standard for His people’s conduct.

Does God’s holiness make Him distant from us?

It would be easy to conclude that this places Him at an unreachable distance, and in one sense, apart from Christ, that conclusion would be correct. Habakkuk 1:13 says God’s “eyes are too pure to look at evil,” and that is not poetic exaggeration. Yet the whole of redemptive history is the story of a holy God making a way for sinful people to draw near anyway, culminating in the cross, where holiness and mercy meet without either being compromised.

This is why I resist any presentation of the gospel that softens this attribute in order to make grace feel more accessible. The cross is only as wonderful as the holiness it satisfies. Strip away the seriousness of God’s set-apart purity, and the cross becomes little more than a kind gesture rather than the only possible remedy for sinners who could never otherwise stand in His presence.

God’s holiness and the call to be holy

Peter applies god’s holiness directly to Christian conduct, quoting Leviticus almost word for word: “You shall be holy, for I am holy” (1 Peter 1:16). This is not a demand to achieve moral perfection through sheer effort. It flows from the previous verses about being born again through the living and abiding word of God, and it describes the natural direction of a life genuinely touched by a holy God, not the precondition for being accepted by Him.

I try to help people see practical holiness as a family resemblance rather than a performance. Children who grow up loved by a particular kind of parent tend, over time and often unconsciously, to develop that parent’s habits and instincts. Something similar happens, by the Spirit’s work, in those who belong to a holy Father.

God’s holiness displayed most fully at the cross

Romans 3:25-26 says God put Christ forward as a propitiation “to show God’s righteousness,” so that He might be “just and the justifier” of the one who has faith in Jesus. That single sentence holds His holiness and His mercy together without collapsing either one. God did not simply overlook sin to extend forgiveness. He judged it fully in His Son, so that holiness was honoured even as grace was extended.

I think this is why the cross rewards a lifetime of study rather than a single sermon. Every time I return to it with god’s holiness more clearly in view, the scandal of grace becomes fresh again, because I see more precisely what it actually cost to satisfy a God this pure.

Living in light of God’s holiness

Awareness of god’s holiness should produce worship before it produces rule-keeping. Isaiah did not respond to the vision in Isaiah 6 by drawing up a list of resolutions. He responded with confession, and only after a seraph touched his lips with a coal from the altar did he hear the commissioning call “Whom shall I send?” Confession and cleansing came before service, and I think that order matters for how we disciple people today.

I encourage the people I pastor to let genuine encounters with this attribute, through Scripture, through worship, through honest prayer, unsettle their comfortable assumptions about their own goodness regularly, not just once at conversion. It is a doctrine meant to be revisited often, not simply learned once and filed away.

The Puritans, whatever their faults, understood this better than much of the modern church does. Stephen Charnock’s work on the attributes of God spends far more space on this single attribute than on any other, precisely because he recognised it as the attribute that gives all the others their proper seriousness. Power without holiness would simply be frightening. Love without holiness would become indulgent sentiment rather than the costly, self-giving love the cross actually displays.

I have also found it helpful to distinguish god’s holiness from mere ritual purity, the kind the Pharisees prized while missing its point entirely. Jesus rebukes exactly this confusion in Matthew 23, condemning leaders who tithed herbs meticulously while neglecting “justice and mercy and faithfulness” (Matthew 23:23). Genuine holiness was never primarily about external ritual. It has always been about a heart and life set apart for God, expressed outwardly because it is first true inwardly.

The New Testament word for holy, hagios, carries the same idea of being set apart, and it is the very word from which we get the term “saints,” meaning those set apart by God rather than those who have achieved some especially impressive standard of moral performance. That linguistic link between God’s own holiness and the identity He gives His people is worth sitting with, because it means our standing as saints rests on being set apart by Him, not on our own track record.

I sometimes point people to the wider biblical vocabulary of the sacred, the way certain objects, days and spaces in the Old Testament were marked out as belonging exclusively to God, not because the material itself was special but because His claim on them made them so. That pattern of setting apart runs through the whole of Scripture, and it helps explain why New Testament believers are repeatedly described as a people who have likewise been set apart for God’s own possession, distinct from the world around them not by isolation but by belonging.

None of this is meant to make God feel unapproachable in a final sense. The wonder of the gospel is precisely that a God this exalted has made a way, through the blood of His Son, for ordinary and flawed people to be welcomed rather than consumed in His presence. That welcome cost everything on the cross, and it is offered freely to anyone who comes to Him in genuine faith and repentance.

If you want to keep exploring the attributes of God, I have written related articles on pursuing holiness after being sanctified, God’s love, divine impassibility, each approaching this same, undivided God from a slightly different angle.

So, now what?

If god’s holiness feels like an intimidating doctrine, let that discomfort do its proper work rather than avoiding it. It is meant to lead you, as it led Isaiah, toward honest confession and then toward the altar where cleansing is actually available. Read Isaiah 6 slowly this week, and let the seraphim’s song reset how you think about the God you are approaching in prayer.

Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory!

Isaiah 6:3