Isaiah 65:13-25
The faithful Israelites will have been mixed for a long time with the mass of the people following the Anti-Christ, but at the appropriate moment God will be able to distinguish them and will reward His servants. Then they will forget their sufferings and will "sing for joy of heart" (v. 14).
We too, children of God, whom the world does not know at present as it did not know Him, will be shown forth by the Lord and with Him at His glorious appearing (1 John 3:1-2). Will our joy be less?
God will create new heavens and a new earth. We are not yet speaking of the replacement of the present universe by new elements as spoken of in 2 Peter 3:13 and Revelation 21:1, but during the reign of a thousand years, both the heavens, relieved of Satan’s presence, and the earth, in submission to the Lord, will be in a new state. Creation will know deliverance (Romans 8:22). Human life will be lengthened: a hundred years will be the age of a child and death will only be an exceptional punishment (Proverbs 2:22; Psalms 37:9). Even the cruel instincts of the animals will have disappeared (v. 25).