After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said,
Come up here, and I will show you things which must be hereafter.
All Commentaries on Revelation 4:1 Go To Revelation 4
Victorinus of Pettau
AD 303
That is the Spirit, whom a little before he confesses that he had seen walking as the Son of man in the midst of the golden candlesticks. And he now gathers from Him what had been foretold in similitudes by the law, and associates with this scripture all the former prophets, and opens up the Scriptures. And because our Lord invited in His own name all believers into heaven, He immediately poured out the Holy Spirit, who should bring them to heaven.