How do we know that God is holy?

God's holiness is a central theme in the Bible and is profoundly illustrated in the context of Christ's sacrifice on the cross. The cry of Jesus in Psalm 22 demonstrates that God, in His holiness, cannot tolerate sin, which necessitated the forsakenness of His Son. This attribute of God is vital to understanding His justice; He must respond to sin with righteousness. Passages such as Isaiah 6:3 proclaim His holiness, 'Holy, holy, holy is the Lord of hosts,' while the events surrounding the cross underscore that God's attribute of holiness demands satisfaction for sin. The liberation Christians experience comes from recognizing that their sins have been fully dealt with through Christ, who took upon Himself the punishment they deserved, showcasing God's holiness and love in perfect harmony.