The Book of Revelations and a few other books too, including the Gospels, hint, and even declare, that God will "wipe away the tears of the Saints". Plus that there will be a new Earth. Plus that lions will sit down with lambs in harmony.
Can God do these? And how can we imagine this happen?
My theory is that since physics seems to show that time itself can be looked at as just a bunch of frames that are only different configurations of the world, God can add or remove a few of these configuration. Without knowing that there was a possibility for something to happen, we can't experience its effects, even if that possibility is removed after it happened.
Your take? How will God do these? Or is the whole premise of those Books different and there is no such thing?
Yes, God can wipe away every tear. We will no longer remember the former things for they will have passed away and therein there will be no more remembrance of such things as would make us grieve - perhaps some unspeakable horror suffered while on earth. God will wipe away every tear.
And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
Revelation 21:4
Won't it be a lovely sight to see the lion lay down with the lamb? The natural realm will reflect the spiritual realm (perfection) - even as it does now here on earth (sin & death), it is even a reflection of Jesus Christ the Lion of Judah and his lambs which are his bride. Perhaps even a depiction of the Shulamite and her beloved! (Song of Songs)
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Remember the story of King David and Nathan? Nathan the prophet tells David the following story. What did the lamb represent? The wife of Uriah. The prophet of God used a lamb to depict someone's wife. Look:
12 And the Lord sent Nathan unto David. And he came unto him, and said unto him, There were two men in one city; the one rich, and the other poor.
2 The rich man had exceeding many flocks and herds:
3 But the poor man had nothing, save one little ewe lamb, which he had bought and nourished up: and it grew up together with him, and with his children; it did eat of his own meat, and drank of his own cup, and lay in his bosom, and was unto him as a daughter.
4 And there came a traveller unto the rich man, and he spared to take of his own flock and of his own herd, to dress for the wayfaring man that was come unto him; but took the poor man's lamb, and dressed it for the man that was come to him.
5 And David's anger was greatly kindled against the man; and he said to Nathan, As the Lord liveth, the man that hath done this thing shall surely die:
6 And he shall restore the lamb fourfold, because he did this thing, and because he had no pity.
7 And Nathan said to David, Thou art the man. Thus saith the Lord God of Israel, I anointed thee king over Israel, and I delivered thee out of the hand of Saul;
8 And I gave thee thy master's house, and thy master's wives into thy bosom, and gave thee the house of Israel and of Judah; and if that had been too little, I would moreover have given unto thee such and such things.
9 Wherefore hast thou despised the commandment of the Lord, to do evil in his sight? thou hast killed Uriah the Hittite with the sword, and hast taken his wife to be thy wife, and hast slain him with the sword of the children of Ammon.
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The lion and the lamb shall indeed lay down together - this is a picture of perfect rest. There is no question but that we shall see lions and lambs laying at rest with one another but the same shall be the case for Jesus Christ and His Bride. We shall be at perfect rest. No spiritual warfare. No violence, wickedness or unholy thing shall be there.