When the world sees the Holy City descending to Earth out of Heaven and the two Annointed Ones rise from the dead, that is when the World will know fear.
Rev 21:1 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. 2 And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband. 3 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. 4 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.
All this happens after the final judgement in Rev 20 that is called the great white throne judgement and Satan and all who have rejected Christ are cast into the lake of fire. Then comes the new heaven and new earth and the New Jerusalem is ushered down from heaven where we will be with the Lord forever.