God's Eternal Nature: Unchangeable from Everlasting to Everlasting

Isaiah 46:12 calls Jacob to hearken to the Lord's immutable character. God's eternity and unchangeableness are inseparable attributes revealed throughout Scripture. Reason itself, as Proclus the Platonist demonstrated, demands that God be eternal—existing of Himself without beginning or end, as Thales defined Him. Yet reason alone cannot suffice; Scripture declares this truth explicitly. Psalm 102:27 proclaims God's eternal existence; He cannot cease to be. His unchangeableness extends to His nature, His purposes (Isaiah 46:10), His promises to the faithful, and His threatenings against the wicked (Numbers 23:19). As God is self-existent and caused by none, He can be changed by none. Being infinite in all perfections, any alteration would diminish His infinity—a logical impossibility. This doctrine of Adonai's unchangeableness stabilizes both His natural and moral government across all dispensations of grace. For believers, this truth ensures the fulfilment of God's promises and accomplishment of His sovereign plans. The Christology here proves decisive: the titles Elohim applies to Himself in Revelation 1:8 and 22:13 establish Christ's Deity beyond question. In the trying changes of mortal existence, God's eternity affords "strong consolation" to the trembling saint. Who can outpace Him who is first? Who can overcome Him who is last and holds the field eternally?