John Wesley on Revelation 21:6

And he - That sat upon the throne. Said to me, It is done - All that the prophets had spoken; all that was spoken, Rev 4:1. We read this expression twice in this prophecy: first, Rev 16:17, at the fulfilling of the wrath of God; and here, at the making all things new. I am the Alpha and the Omega, the beginning and the end - The latter explains the former: the Everlasting. I will give to him that thirsteth - The Lamb saith the same, Rev 22:17.