What Does It Mean That God Is Holy?
Of all the things Scripture says about God, one word gets the rare honour of being repeated three times in a row. When the seraphs cry out in Isaiah’s vision, they do not say God is powerful or wise. They say God is holy. Understanding why requires setting aside the modern sense of the word, because when the Bible says God is holy it means something broader and stranger than moral goodness.
The Meaning of Holy: Set Apart and Morally Pure
The Hebrew root qadosh carries the basic sense of separateness, of being marked off from the ordinary. A day, a garment, a vessel, or a place could be holy, not because it was virtuous but because it had been set aside for God’s use.
Applied to God, this yields the first meaning of holiness: God is other. Not a superior version of us, not the top of a scale we also sit on, but categorically distinct from everything created. A reference summary of how the biblical writers use the language of holiness notes that in the Hebrew Bible God is the Holy One in a way nothing else is, and that people and objects become holy only by association with God.
The second meaning follows from the first. Because God’s otherness is not merely metaphysical, holiness also carries moral weight: absolute purity, complete integrity, no gap between what God is and what God does. One scholarly treatment of what God’s holiness actually consists of argues it is made of two things together, God’s separateness from all that he has created and God’s love.
Isaiah’s Vision and “Holy, Holy, Holy”
The classic text is Isaiah 6. In the year King Uzziah died, the prophet sees the Lord enthroned, the hem of his robe filling the temple, attended by six-winged seraphs calling to one another: “Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory.”
Hebrew has no superlative form, so repetition does the work. Saying something twice intensifies it; saying it three times pushes it as far as the language allows. No other divine attribute receives this treatment anywhere in Scripture.
Isaiah’s reaction is not delight. It is collapse: “Woe is me! I am lost, for I am a man of unclean lips.” Proximity to holiness exposes him. Only after a seraph touches his mouth with a coal from the altar, an act of cleansing he does not perform himself, is he able to answer the call. The pattern of vision, undoing, cleansing, and commission runs through the whole passage.
The title stuck. Scholars observe that “the Holy One of Israel” recurs throughout the book of Isaiah in a way it does not in any other biblical book, and an overview of the prophet Isaiah and his historical setting places these oracles against the pressure of Assyrian expansion in the eighth century BCE.
Holiness and Human Response
Biblical encounters with holiness follow a consistent shape. Moses removes his sandals at the bush. Job stops arguing and puts a hand over his mouth. Peter, after the miraculous catch, asks Jesus to go away from him.
The instinctive response is awe mixed with fear, what one scholar of religion called the mysterium tremendum. Yet in each case the encounter does not end in exclusion. God draws near anyway. The classic theological treatment of holiness as both separation and consecration notes that the term connotes not only religious awe but also what has received God’s own seal.
The Call to Holiness
Scripture does not leave holiness as God’s private property. “You shall be holy, for I the LORD your God am holy” (Leviticus 19:2), a verse 1 Peter 1:16 takes up and applies to the church.
What that means in practice is where Christian traditions diverge. Some emphasise growth in holiness as a gradual work of the Spirit across a lifetime. Wesleyan and Holiness traditions have historically taught that a fuller experience of sanctification is available in this life. Reformed and Lutheran voices tend to stress that believers remain simultaneously righteous and sinful, always dependent on grace.
What the traditions share is the direction of travel. Holiness is not primarily about withdrawal from the world. In Leviticus 19 the command to be holy is followed immediately by instructions about paying wages on time, leaving harvest for the poor, and dealing honestly. Holiness, it turns out, shows up in the details.