Isaiah 65:17 ... For, behold, I create new heavens and a new earth:
and the former shall not be remembered, nor come into mind.
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Sometimes it is hard for us to relate to what it will be like in the new heaven and the new earth.
This current earth will not come to mind ... will not even be remembered.
I have a cousin who is always trouble ... always a grief because of her words which are not according to scripture.
There will be weeks, or even months, that I do not think of this cousin at all and I am happy. If I hear her words (if she calls and talks with me), then she keeps coming to my mind throughout the day and I am grieved.
There are other trouble makers who surface and when I "remember" them I grieve. Then in time, I forget them and they do not come to mind at all. That is when I can be happy, when I do not remember them.
In heaven, this current earth will not come to mind ... happiness, continual joy.
Isaiah 65:18-19 But be ye glad and rejoice for ever in that which I create:
for, behold, I create Jerusalem a rejoicing, and her people a joy.
And I will rejoice in Jerusalem, and joy in my people:
and the voice of weeping shall be no more heard in her, nor the voice of crying.
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Revelation 21 ... And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
And I heard A GREAT VOICE out of heaven saying,
Behold, the tabernacle of God is with men, and HE will dwell with them, and they shall be HIS people, and God HIMSELF shall be with them, and be their God.
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.
And HE that sat upon the throne said, Behold, I make all things new.