What does Eternity Of God mean in the Bible?

Dictionary

Charles Buck Theological Dictionary - Eternity of God
Is the perpetual continuance of his being, without beginning, end, or succession. that he is without beginning, says Dr. Gill, may be proved from,
1. His necessary self-existence, Exodus 3:14 .
2. From his attributes, several of which are said to be eternal, Romans 1:20 . Acts 15:18 . Psalms 103:17 . Jeremiah 31:3 .
3. From his purposes, which are also said to be from eternity, Isaiah 25:1 . Ephesians 3:11 . Romans 9:11 . Ephesians 1:1-23
4. From the covenant of grace, which is eternal, 2 Samuel 3:5 . Mac 5: 2. That he is without end, may be proven from,
1. His spiritually and simplicity, Romans 1:23 .
2. From his independency, Romans 9:5 .
3. From his immutability, 2Pe 1: 24, 25. Malachi 3:6 . Psa 3: 26, 27.
4. From his dominion and government, said never to end, Jeremiah 10:10 . Psalms 10:16 . Daniel 4:3 . That he is without succession, or any distinctions of time succeeding one to another, as moments, minutes, &c. may be proved from,
1. He existence before such were in being, Isaiah 43:13 .
2. The distinctions and differences of time are together ascribed to him, and not as succeeding one another: he is the same yesterday, to-day, and for ever, Hebrews 13:8 . Revelation 1:4 .
3. If his duration were successive, or proceeded by moments, days, and years, then there must have been some first moment, day, and year, when he began to exist, which is incompatible with the idea of his eternity; and, besides, one day would be but one day with him, and not a thousand, contrary to the express language of Scripture, 2 Peter 3:8 .
4. He would not be immense, immutable, and perfect, if this were the case; for he would be older one minute than he was before, which cannot be said of him.
5. His knowledge proves him without successive duration, for he knows all things past, present, and to come: "he sees the present without a medium, the past without recollection, and the future without foresight. To him all truths are but one idea, all places are but one oint, and all times but one moment." Gill's Body of Divinity; Paley's Nat. Theol. p. 480; Charnock on the Divine Perfections; Clarke on ditto; Watts's Ontology, chap. 4:

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Eladah - The Eternity of God
Self-Existence of God - ...
See EXISTENCE and Eternity of God
Alpha - With Omega, the last letter, it is used in the Old Testament and in the New to express the Eternity of God, as including both the beginning and the end
Age of Man - " This is remarkable as being, according to the heading "A prayer of Moses the man of God," for of Moses we read that he lived 120 years, and "his eye was not dim, nor his natural force abated," Deuteronomy 34:7 ; but the Psalms were prophetic both for our, and future times, and Moses leads short-lived man to the Eternity of God
Stand - 102:26, which teaches the indestructibility and/or Eternity of God— the creation perishes but He “shalt endure [2]
Eternity - But we are told that the Eternity of God is a fixed eternal now, from which all ideas of succession, of past and future, are to be excluded; and we are called upon to conceive of eternal duration without reference to past or future, and to the exclusion of the idea of that flow under which we conceive of time. In either case, the Scriptures are greatly impugned; for "He who was, and is, and is to come," is a revelation of the Eternity of God, which is then in no sense true
Creation - Placed in this beautiful temple, and looking around on all its various parts, he cannot help joining with the Psalmist in saying, "O Lord, how manifold are thy works; in wisdom hast thou made them all!" ...
See Eternity of God
Almighty - As, when the Scriptures speak of the Eternity of God, they declare it so as to give us a mere glimpse of that fearful peculiarity of the divine nature, that God is the fountain of being to himself, and that he is eternal, because he is the "I AM;" so we are taught not to measure God's omnipotence by the actual displays of it which we see around us