Albert Barnes' Notes on the Whole Bible - Revelation 1:10
I was in the Spirit - This cannot refer to his own spirit, for such an expression would be unintelligible. The language then must refer to some unusual state, or to some influence that had been brought to bear upon him from without, that was appropriate to such a day. The word “Spirit” may refer either to the Holy Spirit, or to some state of mind such as the Holy Spirit produces - a spirit of elevated devotion, a state of high and uncommon religious enjoyment. It is clear that John does not... read more
The Pulpit Commentary - Revelation 1:10-17
Voices and visions from eternity. "I was in the Spirit on the Lord's day," etc. Concerning this vision, and, indeed, nearly all the visions recorded in this Apocalypse, there are three facts to be predicated at the outset. 1 . It is mental. What is here reported as heard and seen by John was not seen by his bodily eye or heard by his bodily ear. It was, I consider, a purely mental vision. It is one of the characteristic attributes and distinctions of man that he can see and hear... read more