The Revelation of Jesus Christ, which God gave unto him, to show unto his servants things which must shortly come to pass; and he sent and revealed it by his angel unto his servant John:
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Andreas of Caesarea
AD 637
Revelation is the revealing of hidden mysteries when the intellect is enlightened by either divine dreams or by visions from divine enlightenment while awake.
things which must shortly come to pass. this means that some of the prophecies about them are to happen then, and the things concerning the end are not to come until later on, because to God a thousand years is like a prior day, which is like having already happened. Ps. 89:4