The prophet Isaiah and the new earth: The former things will not be remembered, nor will they come to mind. Isaiah 65:17

The Book of Isaiah consists of three well-defined parts, the first part most likely was the work of Isaiah himself, while the other two were works added in later periods, that is, during the exile in Babylon and then after it.
And the Third Book of Isaiah deals, among other topics, with the eschatological hope, when the author taught in his writings about a new heaven and a new earth.
Here the author didn't speak about the end of the world or the end of humanity, but to a renewal of times where God will definitively establish his home among men; this idea is also very marked, for example in the prophecies of Joel (Joel 2:28-32). In more practical terms, this renewal would consist in a descent of the wisdom of God, which would bring the end of original sin and the consequent suffering in humanity.
This teaching of the prophet Isaiah has had a deep echo in the Christian teachings and particularly in the doctrine of the Kingdom of God, the dominion or empire of God's perfections. For example, we see how the apostle Paul taught about that man renewed in Christ who, in the face of the difficulties of the world, sets his spiritual sight on that new world to come: "But in keeping with his promise we are looking forward to a new heaven and a new earth, were righteousness dwells" 2 Peter 3:13.
In this way, Isaiah prophesied the arrival of these new times, which according to the Christian faith is associated with the second coming of the Lord Jesus:
"See, I will create
new heavens and a new earth.
The former things will not be remembered,
nor will they come to mind.
But be glad and rejoice forever
in what I will create,
for I will create Jerusalem to be a delight
and its people a joy.
I will rejoice over Jerusalem
and take delight in my people;
the sound of weeping and of crying
will be heard in it no more.
Never again will there be in it
an infant who lives but a few days,
or an old man who does not live out his years:
the one who dies at a hundred
will be thought a mere child;
the one who fails to reach a hundred
will be considered accursed.", Isaiah 65:17-20.

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