"The Lord is merciful and gracious, slow to anger, and plenteous in mercy; he will not always chide; neither will he keep his anger for ever." Psalm 103:8, 9
God is angry and justly angry with the sins of his people. He hates sin with a perfect hatred. He cannot but entertain unceasing wrath against it. It is so contrary to the purity and perfection of his holy nature, that wherever he meets with sin his indignation flashes out against it. And till we have some discovery and manifestation of Christ to assure us of an interest in his precious blood and finished work, we cannot separate the anger of God against our sins from the anger of God against our persons. But when the Lord is pleased to reveal a sense of his goodness and mercy in the Person and work of his dear Son, then we can see by the eye of faith that though he is angry with our sins, he is not angry with our persons, but accepts us in the Beloved, having chosen us in him before the foundation of the world, that we should be holy and without blame before him in love.
Thus he retains not his anger for ever. And why? Because it is propitiated, put away, not retained so as to burn to the lowest hell. The blessed Lord has offered a sacrifice for sin; put away the punishment and penalty due to transgression, propitiated and appeased, and thus put away his indignation and fiery displeasure against the sins of his people; for all the anger of God due to their sins and to their persons was discharged upon the Person of Jesus as he stood our representative and hung upon the cross a bleeding sacrifice, putting away sin by the offering of himself. This is the reason why he retaineth not his anger for ever, it being appeased and put away through the propitiation of our blessed Lord, that it should not burn against the persons of the people of God, nor consume them with the fiery indignation that shall burn up the wicked.