What was John talking about when he said I was in the spirit on the Lord's day?

When John mentioned being "in the spirit on the Lord's day," he was referring to a spiritual experience or revelation he had while in a state of deep communion with God, specifically on a Sunday, which is traditionally considered the Lord's Day in Christianity. This phrase is found in Revelation 1:10, where John describes receiving divine visions and messages about the future of the church and the end times. His experience signifies a moment of profound spiritual insight and connection, setting the stage for the apocalyptic visions that follow in the Book of Revelation.