A.W. Pink on the attribute of God’s holiness, from chapter 8 of Pink’s book on God’s attributes:
God’s holiness is manifested at the Cross. Wondrously and yet most solemnly does the Atonement display God’s infinite holiness and abhorrence of sin. How hateful must sin be to God for Him to punish it to its utmost deserts when it was imputed to His Son!
Not all the vials of judgment that have or shall be poured out upon the wicked world, nor the flaming furnace of a sinner’s conscience, nor the irreversible sentence pronounced against the rebellious demons, nor the groans of the damned creatures, give such a demonstration of God’s hatred of sin, as the wrath of God let loose upon His Son. Never did Divine holiness appear more beautiful and lovely than at the time our Saviour’s countenance was most marred in the midst of His dying groans. This Himself acknowledges in Psa. 22. When God had turned His smiling face from Him, and thrust His sharp knife into His heart, which forced that terrible cry from Him, “My God, My God, why hast Thou forsaken Me?” He adores this perfection—”Thou art holy,” v. 3 (S. Charnock).
Because God is holy He hates all sin. He loves everything which is in conformity to His laws, and loathes everything which is contrary to it. His Word plainly declares, “The froward is an abomination to the Lord” (Prov. 3:32). And again, “The thoughts of the wicked are an abomination to the Lord” (Prov. 15:26). It follows, therefore, that He must necessarily punish sin. Sin can no more exist without demanding His punishment than without requiring His hatred of it. God has often forgiven sinners, but He never forgives sin; and the sinner is only forgiven on the ground of Another having borne his punishment; for “without shedding of blood is no remission” (Heb. 9:22). Therefore we are told, “The Lord will, take vengeance on His adversaries, and He reserveth Wrath for His enemies” (Nahum 1:2). For one sin God banished our first parents from Eden. For one sin all the posterity of Ham fell under a curse which remains over them to this day (Gen. 9:21). For one sin Moses was excluded from Canaan, Elisha’s servant smitten with leprosy, Ananias and Sapphira cut off out of the land of the living.