A.W. Pink marvelously proclaims the wrath of God (found in Knowing God by J. I. Packer at the end of the chapter on the wrath of God).
The wrath of God is a perfection of the Divine character on which we need to meditate frequently. First, that our hearts may be duly impressed by God’s detestation of sin. We are ever prone to regard sin lightly, to gloss over its hideousness, to make excuses for it. But the more we study and ponder God’s abhorrence of sin and His frightful vengeance upon it, the more likely are we to realize its heinous. Second, to beget a true fear in our souls for God. ‘Let us have grace whereby we may serve God acceptably with reverence and godly fear: for our God is a consuming fire’ (Heb. 12:28, 29). We cannot serve Him ‘acceptably’ unless there is due ‘reverence’ for His awful Majesty and ‘godly fear’ of His righteous anger, and these are best promoted by frequently calling to mind that ‘our God is a consuming fire.’ Third, to draw out our soul in fervent praise [to Jesus Christ] for having delivered us from ‘the wrath to come’ (1 Thess. 1:10). Our readiness or our reluctancy to meditate upon the wrath of God becomes sure test of how our hearts really stand affected towards Him.
Dennis Johnson in Him We Proclaim: Preaching Christ from All the Scriptures quotes on page 57 from Select Sermons of George Whitefield (London: Banner of Truth, 1958), 81-83, on the continually propensity for all of us to become legalists at any moment of our lives. Thus, implying the constant need for the Gospel to be at the forefront of our minds and heart.
When a poor soul is somewhat awakened by the terrors of the Lord, then the poor creature, being born under the covenant of works, lies directly to a covenant of works again. And as Adam and Eve hid themselves…and sewed fig leaves . . . so the poor sinner, when awakened, flies to his duties and to his performances, to hide himself from God, and goes to patch up a righteousness of his own. Says he, I will be mighty good now—I will reform I will do all I can; and then certainly Jesus Christ will have mercy on me.