"Before the mountains were born or You gave birth to the earth and the world, even from everlasting to everlasting, You are God."
— Psalm 90:2 (NASB95)

"Eternity" in Scripture is first a statement about God and only then a statement about human destiny. The eternal God — without beginning, without end, unbounded by the time He created — grants creatures a share in unending life or consigns them to unending loss; and He has, remarkably, "set eternity in their heart" (Ecclesiastes 3:11), so that no human being is finally satisfied by the merely temporal. This study examines the vocabulary of eternity in both Testaments, God's own eternality, the nature of eternal life (which Scripture defines qualitatively before quantitatively), and the shape of the believer's everlasting future.

Passages studied: Psalm 90:1–4; Ecclesiastes 3:11; Isaiah 57:15; John 17:3; 2 Corinthians 4:16–18; 1 Corinthians 15:24–28 with Revelation 22:3–5.

The Vocabulary of Eternity

The Old Testament term is עוֹלָם (ʿôlām, Strong's H5769) — "long duration, antiquity, futurity, perpetuity" (HALOT, s.v. "עולם"; TWOT §1631a); its force runs from "a very long time" to strict everlastingness, with context deciding — but when doubled and attached to God ("from ʿôlām to ʿôlām," Psalm 90:2) it reaches as far as language can: unbounded in both directions. The New Testament counterpart is αἰώνιος (aiōnios, Strong's G166), the adjective of αἰών (aiōn, "age"): "pertaining to a period of unending duration, without end" (BDAG, 3rd ed., s.v. "αἰώνιος," 3), and in eschatological usage, the quality of "the age to come" breaking into the present. The idiom εἰς τοὺς αἰῶνας τῶν αἰώνων ("unto the ages of the ages," e.g., Revelation 22:5) is the strongest duration formula Greek possesses — used identically of God's reign, the saints' reign, and the judgment of the devil (Revelation 20:10).

Key Passages

Psalm 90:1–4 — From Everlasting to Everlasting

Psalm 90:1–4

NASB95 (v. 2, 4): "Before the mountains were born or You gave birth to the earth and the world, even from everlasting to everlasting, You are God... For a thousand years in Your sight are like yesterday when it passes by, or as a watch in the night."

Moses — the psalm's superscription makes this the oldest psalm — sets God's eternality against human transience (vv. 3–6: dust, grass, a sigh). Before creation existed, "You are God" — present tense across the everlasting. Verse 4 (echoed in 2 Peter 3:8) is not a conversion formula ("one day = 1,000 years") but a statement of God's transcendence over time: millennia register to Him as a night-watch does to us. Scripture consistently presents God as the creator of time — "before the ages" wisdom was decreed (1 Corinthians 2:7); grace was given us in Christ "from all eternity", literally "before times eternal" (2 Timothy 1:9; Titus 1:2) — and therefore not confined by it, though He acts freely within it. The name He announces from the bush points the same direction: "I AM WHO I AM" (Exodus 3:14) — undated, underived being; Jesus' appropriation of it — "before Abraham was born, I AM" (John 8:58) — claims that same eternality for the Son (cf. Hebrews 13:8; Revelation 1:8 — "who is and who was and who is to come").

Isaiah 57:15 — The High and Lofty One Who Inhabits Eternity

Isaiah 57:15

NASB95: "For thus says the high and exalted One who lives forever, whose name is Holy, 'I dwell on a high and holy place, and also with the contrite and lowly of spirit in order to revive the spirit of the lowly and to revive the heart of the contrite.'"

The One "who lives forever" (the KJV's memorable "that inhabiteth eternity" renders שֹׁכֵן עַד, shōkhēn ʿad — "dwelling perpetually") pairs His transcendence with an address list that should astonish: the high and holy place and the crushed and lowly heart. Eternity in Scripture never floats free into abstraction; the eternal God is the reviving God. The same pairing closes the Bible: the everlasting throne and the wiped tear (Revelation 21:3–4).

Ecclesiastes 3:11 — Eternity in the Heart

Ecclesiastes 3:11

NASB95: "He has made everything appropriate in its time. He has also set eternity in their heart, yet so that man will not find out the work which God has done from the beginning even to the end."

Between the poem of times and seasons (3:1–8) and the frustration of life "under the sun," Qoheleth drops this anthropological key: God has placed הָעֹלָם (hā-ʿōlām — "eternity," the same word as above) in the human heart — an inbuilt awareness of, and appetite for, what outlasts time, joined to an inability to see the whole of God's work. This is why nothing temporal finally satisfies (cf. Psalm 16:11 — fullness of joy is located in God's presence, not in things under the sun) and why every culture in history has buried its dead facing some hope. The verse is the Old Testament's quiet argument that humans were made for more than time — the imago Dei carrying an echo of the everlasting God it images.

John 17:3 — Eternal Life Defined

John 17:3

NASB95: "This is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent."

In His high-priestly prayer Jesus defines ζωὴ αἰώνιος (zōē aiōnios) — and the definition is relational before it is durational: eternal life is knowing (γινώσκω, ginōskō, Strong's G1097 — experiential, personal knowledge, the verb of covenant intimacy, not mere information; BDAG, s.v. "γινώσκω," 3) the only true God and Jesus Christ. Eternal life is the life of the age to come — God's own kind of life — possessed now: John's Gospel puts it insistently in the present tense ("he who believes in the Son has eternal life," John 3:36; 5:24; 1 John 5:11–13 — "these things I have written... so that you may know that you have eternal life"). Duration follows from quality: because the life is God's own, it cannot die (John 11:26). Eternity for the believer therefore does not begin at death or resurrection; it begins at new birth and is unveiled at glory.

2 Corinthians 4:16–18 — The Eternal Weight of Glory

2 Corinthians 4:16–18

NASB95 (vv. 17–18): "For momentary, light affliction is producing for us an eternal weight of glory far beyond all comparison, while we look not at the things which are seen, but at the things which are not seen; for the things which are seen are temporal, but the things which are not seen are eternal."

Paul — catalogues of beatings, shipwrecks, and anxieties notwithstanding (2 Corinthians 11:23–28) — files all affliction under "momentary" and "light" by weighing it on eternity's scale: the coming glory is a βάρος (baros, "weight") — likely a play on the Hebrew כָּבוֹד (kāvôd, "glory," from a root meaning "heavy"). Eternity here functions as practical optics: σκοπέω (skopeō, "to fix attention on") the unseen-eternal rather than the seen-temporal is the learned discipline that makes endurance rational (Romans 8:18; Hebrews 11:24–27 — Moses "endured, as seeing Him who is unseen"). A believer's view of eternity is not speculation about the far future; it is the load-bearing wall of present perseverance.

1 Corinthians 15:24–28 & Revelation 22:3–5 — God All in All

1 Corinthians 15:24–28; Revelation 22:3–5

NASB95 (1 Cor 15:28): "When all things are subjected to Him, then the Son Himself also will be subjected to the One who subjected all things to Him, so that God may be all in all."

NASB95 (Rev 22:3–5, excerpts): "...His bond-servants will serve Him; they will see His face... and they will reign forever and ever."

The eternal state's inner logic: every enemy subdued, death abolished, the mediatorial kingdom handed over, "so that God may be all in all" — unobstructed communion as the environment of existence (the Son's "subjection" is the voluntary ordering of the incarnate Mediator's completed commission, not an ontological demotion — the Lamb shares the one throne, Revelation 22:1, 3). What do the redeemed do forever? Revelation's answer has verbs: they serve (latreuō — priestly service), they see His face (the vision denied Moses, Exodus 33:20, now the common property of all the redeemed), and they reign forever — restored royalty (Genesis 1:28; 2 Timothy 2:12). Eternity is not an endless church service in the clouds but glorified embodied life — worship, work, dominion, discovery — on the new earth in the immediate presence of God. And since "of His kingdom there will be no end" (Luke 1:33; Daniel 7:14), the redeemed will need eternity to explore "the surpassing riches of His grace" which God will be showing them "in the ages to come" (Ephesians 2:7) — an infinite God guarantees an unexhausted future.

Conclusion

Eternity belongs first to God — from everlasting to everlasting, the I AM who created time and inhabits what no creature can — and becomes ours only by gift: eternal life defined as knowing Him, possessed now in Christ, unveiled in resurrection, and spent on a new earth seeing His face. Scripture's eternity is therefore neither the philosopher's static timelessness nor the cartoon's harps-on-clouds; it is the unending expansion of covenant fellowship — served, seen, reigned, enjoyed — with the eternal weight of glory making every present affliction light. The doctrine issues two summonses: to the sufferer, look at what is unseen; to everyone, take seriously the heart's inbuilt ʿōlām — a hunger no temporal thing was ever going to feed, because it was placed there by the One who "has set eternity in their heart."