In fact, a moment's reflection will reveal that if God is 'subject to like passions as we are' (cf. James 5:17), His immutability is seriously undermined at every point. If His creatures can literally make Him change His mood by the things they do, then God isn't even truly in control of His own state of mind. If outside influences can force an involuntary change in God's disposition, then what real assurance do we have that His love for us will remain constant? That is precisely why Jeremiah cited God's immutability and impassibility as the main guarantee of His steadfast love for His own: 'It is of the Lord's mercies that we are not consumed, because his compassions fail not' (Lamentations 3:22). God Himself made a similar point in Malachi 3:6: 'For I am the Lord, I change not; therefore ye sons of Jacob are not consumed.'
God is unchanging and unchangeable, but He is not devoid of affection for His creation. His impassibility should never be set against His affections. His immutability does not rule out personal involvement with His creatures. Transcendence isn't incompatible with immanence.
God is not a metaphysical iceberg. While He is never at the mercy of His creatures, neither is He detached from them. His wrath against sin is real and powerful. His compassion for sinners is also sincere and indefatigable. His mercies are truly over all His works. And above all, His eternal love for His people is more real, more powerful, and more enduring than any earthly emotion that ever bore the label 'love.' Unlike human love, God's love is unfailing, unwavering, and eternally constant. That fact alone ought to convince us that God's affections are not like human passions.
--- Phillip R. Johnson, God Without Mood Swings
|Christ in Majesty|
Master of the Brussels Initials