There are two things the Lord is revealing here to keep separated I believe, the Kingdom of God and the Day of the Lord. The kingdom is within us. It is unseen by eye. It is not a place as we would know the word place. It is at hand. The Day is coming, only the Father knows when, as a thief in the night, the five bridesmaid lamps run out of oil, Daniel Ezekiel and Revelations end of the world kind of stuff. The Pharisees were so wrapped up in the notion that the Kingdom was earthly, that the Messiah was going to establish the earthly Kingdom first and upon doing that His Day would come. How then could two people be working in the field together and one be snatched away to the Kingdom? No the Kingdom is spiritual, the Day is day of final judgment, then there will be a millennium of earthly rule, then there will be an eternity in the new earth/heaven/Jerusalem.
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