Yes I think I understand what you mean. Time can only take place in the creation, because time can only be measured in terms of the cycles of birth, life and death in creation. How old is a person? How old is a star or a galaxy? It can only be measured if the person does not live forever.
So time is a bubble inside a big balloon called eternity, and I believe there is a lot more to be understood by the statement in Romans 8:21 than meets the eye:
19 For the earnest expectation of the creation waits for the manifestation of the sons of God.
20 For the creation was not willingly subjected to vanity, but because of Him who subjected it on hope
21 that
the creation itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.
22 And we know that the whole creation groans and travails in pain together until now.
23 And not only so, but ourselves also, who have the firstfruit of the Spirit, even we ourselves groan within ourselves,
awaiting adoption, the redemption of our body.
24 For we are saved by hope. But hope that is seen is not hope; for what anyone sees, why does he also hope for it?
25 But if we hope for that which we do not see, then we wait for it with patience.
You see, God created a body for Adam. He isn't just a soul.
The biblical concept of eternal life
is inextricably intertwined with being alive in a body. Below is a list of the New Testament scriptures using the Greek word záō (alive).
None of them are in reference to someone who has died / fallen asleep / is not alive, i.e not living in his body. Not one:
|| Matthew 16:16; Matthew 22:32; Matthew 26:63; Matthew 27:63; Mark 5:23; Mark 12:27; Mark 16:11; Luke 2:36; Luke 4:4; Luke 10:28; Luke 15:13; Luke 20:38; Luke 24:5; Luke 24:23; John 4:10; John 4:11; John 4:50; John 4:51; John 4:53; John 5:25; John 6:51; John 6:57; John 6:58; John 6:69; John 7:38; John 11:25; John 11:26; John 14:19; Acts 1:3; Acts 7:38; Acts 9:41; Acts 10:42; Acts 14:15; Acts 17:28; Acts 20:12; Acts 22:22; Acts 25:19; Acts 25:24; Acts 26:5; Acts 28:4; Romans 1:17; Romans 6:2; Romans 6:10; Romans 6:11; Romans 6:13; Romans 7:1; Romans 7:2; Romans 7:3; Romans 7:9; Romans 8:12; Romans 8:13; Romans 9:26; Romans 10:5; Romans 12:1; Romans 14:7; Romans 14:8; Romans 14:9; Romans 14:11; 1 Corinthians 7:39; 1 Corinthians 9:14; 1 Corinthians 15:45; 2 Corinthians 1:8; 2 Corinthians 3:3; 2 Corinthians 4:11; 2 Corinthians 5:15; 2 Corinthians 6:9; 2 Corinthians 6:16; 2 Corinthians 13:4; Galatians 2:14; Galatians 2:19; Galatians 2:20; Galatians 3:11; Galatians 3:12; Galatians 5:25; Philippians 1:21; Philippians 1:22; Colossians 2:20; Colossians 3:7; 1 Thessalonians 1:9; 1 Thessalonians 3:8; 1 Thessalonians 4:15; 1 Thessalonians 4:17; 1 Thessalonians 5:10; 1 Timothy 3:15; 1 Timothy 4:10; 1 Timothy 5:6; 1 Timothy 6:17; 2 Timothy 3:12; 2 Timothy 4:1; Titus 2:12; Hebrews 2:15; Hebrews 3:12; Hebrews 4:12; Hebrews 7:8; Hebrews 7:25; Hebrews 9:14; Hebrews 9:17; Hebrews 10:20; Hebrews 10:31; Hebrews 10:38; Hebrews 12:9; Hebrews 12:22; James 4:15; 1 Peter 1:3; 1 Peter 1:23; 1 Peter 2:4; 1 Peter 2:5; 1 Peter 2:24; 1 Peter 4:5; 1 Peter 4:6; 1 John 4:9; Revelation 1:18; Revelation 2:8; Revelation 3:1; Revelation 4:9; Revelation 4:10; Revelation 5:14; Revelation 7:2; Revelation 7:17; Revelation 10:6; Revelation 13:14; Revelation 15:7; Revelation 16:3; Revelation 19:20 (cast alive into the lake of fire); Revelation 20:4. ||
That's how we're born when we come into the world:
alive in a body, (because that's how Adam was created) - but we will also die, our bodies will decay, and we would have remained eternally dead to God, the source of all life, unless we are born of the Spirit of God from above also.
And it's
because Adam was created with a body that the resurrection is
an integral part of the gospel.
The Greek noun used in the New Testament for The Resurrection is ho anástasis: ("the resurrection"). Without fail, each and every time anástasis is used in the New Testament, it's referring to the
bodily resurrection:
|| Matthew 22:23, 28 & 30-31; Mark 12:18 & 23; Luke 2:34; Luke 14:14; Luke 20:27, 33, 35-36; John 5:29; John 11:24-25; Acts 1:22; Acts 2:31; Acts 4:2; Acts 4:33; Acts 17:18, 32; Acts 23:6, 8; Acts 24:15, 21; Acts 26:23; Romans 1:4; Romans 6:5; 1 Corinthians 15:12-13, 21, 42; Philippians 3:10; II Timothy 2:18; Hebrews 6:2; Hebrews 11:35; I Peter 1:3; I Peter 3:21; Revelation 20:5-6. ||
All of the following verses below use one or more of the following words, and all are speaking about the
bodily resurrection:
égersis; anístēmi; egeírō:
|| Matthew 9:25; Matthew 10:8; Matthew 11:5; Matthew 14:2; Matthew 17:9; Matthew 16:21; Matthew 17:23; Matthew 20:19; Matthew 26:32; Matthew 27:52-53 & 63-64; Matthew 28:6-7; Mark 6:14 & 16; Mark 12:26; Mark 14:28; Mark 16:6 & 14; Luke 7:14; Luke 7:22; Luke 8:54; Luke 9:7 & 22; Luke 14:13-14; Luke 20:37; Luke 24:6; Luke 24:34; John 2:19-21; John 5:21; John 5:28-29; John 6:39, 40 & 44; John 11:23-35; John 12:1, 9 & 17; John 21:14; Acts 1:22; Acts 2:24, 31-32; Acts 3:15 & 26; Acts 4:1-2, 10 & 33; Acts 5:30; Acts 10:40; Acts 13:30 & 33-37; Acts 17:18 & 31-32; Acts 23:6-8; Acts 24:15 & 21; Acts 26:8; Romans 1:4; Romans 4:23-25; Romans 6:4-5; Romans 6:9; Romans 7:4; Romans 8:11; Romans 8:34; Romans 10:9; 1 Corinthians 6:14; 1 Corinthians 15:4, 12-23, 35-36, 42-45, 50-57; 2 Corinthians 1:9; 2 Corinthians 4:14; 2 Corinthians 5:15; Galatians 1:1; Ephesians 1:20; Ephesians 2:5-6; Ephesians 5:14; Philippians 3:10-11; Colossians 2:12-13; Colossians 3:1 (Compare with Romans 6:5); 1 Thessalonians 1:9-10; 1 Thessalonians 4:13-16; 2 Timothy 2:8 & 18; Hebrews 6:1-2; Hebrews 11:35; 1 Peter 1:3-5; 1 Peter 1:21; 1 Peter 3:18 & 21; Revelation 20:5-6. ||
Not one New Testament verse employing any of the above listed words associated with
The Resurrection (ansastis) is not talking about the
bodily resurrection. Not one.
1 Corinthians 15:17-18 says,
"And if Christ is not raised, your faith is foolish; you are yet in your sins. Then also those that fell asleep in Christ were lost."
Again, speaking of those who fell asleep in Christ, Paul continues,
"If in this life only we have hope in Christ, we are of all men most miserable. But now Christ has risen from the dead, and has become the firstfruit of those who slept. For since death is through man, the resurrection of the dead also is through a Man. For as in Adam all die, even so in Christ all will be made alive." (1 Corinthians 15:19-22).
Then he says,
"But each in his own order: Christ the first-fruit, and afterward they who are Christ's at His coming." (1 Corinthians 15:19-23).
So
eternal life (in eternity) is inextricably linked to being alive forever in
a body that does not die.
This is the gospel. and for the sake of
@Truth7t7 , this is Christianity 101.
So even though time is linked to the creation and to the cycles of birth, life and death in the creation, and even though time is a bubble inside a balloon called eternity, any discussion about eternity is meaningless unless it involves the reality of death and the resurrection from death, which Christ, the last Adam, bought for man, shedding His own blood and entering into death Himself for us, and then rising again from the dead
bodily, and is alive (zao) in a body forevermore.
So the answer to your OP about "the transition from the times of this world to eternity" is that it occurred when Jesus rose from the dead, and without this gospel of the resurrection of Christ from the dead any discussion about eternity is meaningless.