And I quote:
"In his posthumously-published Observations upon the Prophecies of Daniel, and the Apocalypse of St. John, Newton expressed his belief that Bible prophecy would not be understood "until the time of the end", and that even then "none of the wicked shall understand". Referring to that as a future time ("the last age, the age of opening these things, be now approaching"), Newton also anticipated "the general preaching of the Gospel be approaching" and "the Gospel must first be preached in all nations before the great tribulation, and end of the world."
The year 2060 AD is also mentioned as: (I will auspiciously be 77 by then...)
"...he believed the world was to be replaced with a new one based upon a transition to an era of divinely inspired peace... [or] The Second Coming of Jesus Christ and the establishment of Paradise by The Kingdom of God on Earth."