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Jesus uses this same expression to refer to himself, in particular if he refers to his return when the Kingdom of God will be fulfilled. Biblical Unitarians do not say that Jesus is a man like you and I. He is the appointed Messiah. But the Messiah is a human, not a half-god. The expression Son of Man underlines just that he is a human and that he has an outstanding role for us attrbuted to him by his and our Father, God.