Some food for thought, with the text I’ve highlighted in bold of particular interest:

“(I)f the book were written before the destruction of Jerusalem, and the prophecies in it relate to that destruction, and the civil wars among the Romans, which lasted but three or four years, then it might be said the Revelation is of things which must shortly come to pass. But if we consider the book as referring to the state of the Church in all ages, the words here, and those in Rev_1:3, must be understood of the commencement of the events predicted…”