To call someone God implies not just greatness, but being the One of whom there is none greater. The God of the Bible said, “Before me no god was formed, nor will there be one after me. I, even I, am the LORD, and apart from me there is no savior.” (Isa. 43:10-11) — How can He make that claim? Because He is eternal.
God MUST BE eternal to be God
If a great being came into existence at some point in time, what we have is “a” god, not the God. That god would be locked into time. If he came into being, what’s to say he won’t cease to exist. A God who is without beginning or end is the One of whom there is none greater.
LORD, are you not from everlasting? My God, my Holy One, you will never die. … (Hab. 1:12)
Scripture opens with “In the beginning God …”, assuming God already existed before time began. He always was and always will be. That explains how God could call Himself “I AM” (Ex. 3:14).
Before the mountains were born or you brought forth the whole world, from everlasting to everlasting you are God. (Ps. 90:2)
Implications of having an Eternal God:
1) Only an Eternal God is able to offer eternal blessings. In Him we have eternal salvation and everlasting life (Matt. 25:46; Jn. 3:15-16; 5:24; 10:28). He also gives us joy and eternal pleasures (Ps. 16:11), eternal encouragement and good hope (2 Thess. 2:16), an eternal house in heaven (2 Cor. 5:1), and an eternal inheritance (Heb. 9:15). — This gives our life here on earth, no matter how difficult it might get, increased meaning and purpose.
Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all. So we fix our eyes not on what is seen, but on what is unseen, since what is seen is temporary, but what is unseen is eternal. (2 Cor. 4:16-18)
2) Likewise, only an Eternal God can follow through on eternal judgment (Matt. 25:46; 2 Thess. 1:9; Jude 1:6-7). — This should give us increased motivation to reach out to others with His message of salvation.
… punished with everlasting destruction and shut out from the presence of the Lord and from the glory of his might (2 Thess. 1:9)
3) What He speaks can stand true throughout all eternity (Gen. 9:16; 17:7, 13, 19; Ps. 119:89, 160; 145:13; Heb. 13:20). — This gives us reason to trust His Word, covenants, and promises, even if we don’t see its fulfillment in our earthly lifetime.
Your word, LORD, is eternal; it stands firm in the heavens. (Ps. 119:89)
All your words are true; all your righteous laws are eternal. (Ps. 119:160)
4) To be God He would also have to remain true to Himself, to who He is, throughout all eternity. — This means we can count on His unfailing love (Ps. 103:17; Jer. 31:3), kindness (Isa. 54:8; Jer. 31:3), righteousness (Ps. 103:17; 119:142), power (Rom. 1:20), etc. Hence, we have an eternal Rock to stand upon (Is. 26:4) who is always out for the welfare of His people and an eternal King (Jer. 10:10) capable of ruling justly.
The eternal God is your refuge, and underneath are the everlasting arms. (Deut. 33:27)
5) To Him belongs eternal praise (Ps. 106:48; 111:10; Neh. 9:5). He existed before us and all of creation, making Him the One of whom there is none greater. — This means no one else is more worthy of our worship. He deserves our all.
Now to the King eternal, immortal, invisible, the only God, be honor and glory for ever and ever. Amen. (1 Tim 1:17)
Learn More About God: Theology Resources