For behold, I create new heavens and a new earth; and the former things will not be remembered or come to mind. But be glad and rejoice forever in what I create; for behold, I create Jerusalem for rejoicing and her people for gladness. I will also rejoice in Jerusalem and be glad in My people; and there will no longer be heard in her the voice of weeping and the sound of crying.
Things will one day be the way they were before the Fall!
God said the same thing to Isaiah as He said later to the Apostle John in greater detail: "Behold, I am making all things new" and "there will no longer be any curse" (see Revelation 21:5 and 22:3).
The world will no longer be a place of grieving, pain and tears. Instead it will be a place to "be glad and rejoice forever". Everything about life in that day will bring joy, happiness and peace. Things will be the way God designed them to be in the first place, before the sin of the first man and woman brought brokenness and fallenness into every facet of life.
Today God is encouraging us to look into the future. Our hope is not in this world and this life. God will destroy this fallen world one day and create a new heaven and a new earth, where things are right. I can't wait!