God’s wrath is not a temporary loss of self-control or a selfish fit of emotion. It is His holy, white-hot hatred of sin, the reaction and revulsion of His holy nature against all that is evil. God’s wrath is tied in directly with His justice. It has to do with His righteous determination to punish every sin, to balance the scales of justice, and to make every wrong right. That is why the wrath of God “abides on” every unbeliever. The more men persist in sin, the more they are “storing up wrath for themselves in the day of wrath and revelation of the righteous judgment of God.” God’s wrath will eventually be “poured out”; He is a righteous judge and will not allow sin to go unpunished forever.
– Charles Leiter