2 Peter 3:10 (KJV) But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
At the conclusion of the Millennium, the Day of the Lord shall come very unexpectedly. At that time all the elements will melt, and then God will reform the new earth. He will by preparing for our eternity. Are you prepared for eternity?
(Read 2 Peter 3:12-13)