Holy means God is unlike anyone else
The Hebrew word often translated holy, qadosh, speaks of what is set apart or distinct. God is not merely the strongest or wisest being in the universe. He is the Maker of heaven, earth, and every creature, while all else depends on him. After Israel crossed the Red Sea, Moses marvelled that no one could compare with the Lord in holiness (Exodus 15:11).
Isaiah saw this in a vision of God’s throne. Heavenly beings declared God’s holiness, while the temple shook with the weight of his glory (Isaiah 6:1-4). Calling God holy three times draws attention to the fullness of his majesty. He is greater than our categories, our imaginations, and every power we might fear.
And one cried unto another, and said, Holy, holy, holy, is the Lord of hosts: the whole earth is full of his glory.
God is perfectly pure
God’s holiness also means perfect moral goodness. He never lies, abuses power, acts cruelly, or overlooks evil as though it were harmless. Habakkuk, surrounded by violence and injustice, recognised that God is too pure to look favourably on wrongdoing (Habakkuk 1:13).
That purity can feel unsettling because it shows us ourselves clearly. When Isaiah encountered God’s holiness, he became painfully aware of his own uncleanness and sin (Isaiah 6:5). This is not meant to crush us. It brings us out of denial and into the truth, where forgiveness can begin.
Holiness includes justice and mercy
Because God is holy, he is rightly opposed to what destroys and degrades people. His judgement is not a flash of bad temper. It is the settled response of a good King to cruelty, deceit, oppression, and rebellion. Psalm 99 connects God’s holiness with his love of justice and his righteous rule (Psalm 99:4-5).
Yet holiness is not the opposite of love. Christians see both God’s justice and mercy most clearly in Jesus. Jesus faced real temptation but did not sin, so those who trust him are invited to come confidently to God for mercy, grace, and timely help (Hebrews 4:15-16). God does not ask people to clean themselves up before approaching him.
Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
How should we respond?
God’s holiness calls for reverence, honesty, and worship. But reverence is not the same as running away in hopeless fear. In Isaiah’s vision, God dealt with Isaiah’s guilt and then gave him a calling (Isaiah 6:6-8). The holy God is able to cleanse and restore those who turn to him.
For Christians, becoming holy means learning to reflect God’s character in ordinary life. Peter calls believers to turn from sin and live in a way that belongs to their holy Father (1 Peter 1:15-16). It is a growing response to God’s grace, not a claim to instant perfection. If you feel far from God, begin honestly. God promises forgiveness and cleansing to those who confess their sin (1 John 1:9).
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.