And the One seated on the throne said: ‘Look! I am making all things new.’ Also, he says: ‘Write, because these words are faithful and true.’”​—Revelation 21:1-5.

Not mortal humans but God himself gives a guarantee regarding these blessings. He is the One who says Re 21:5: “Look! I am making all things new.” Yes, and Jehovah God told the apostle John: “Write, because these words are faithful and true.”