Saul knew immediately and absolutely just who was speaking to him.  For his response to the voice was, “Who are You, Lord?”  For in an instant, Saul realized the deity and supremacy of the voice of the Lord.  We all someday will hear that same voice of the Lord.  For some it will be the stern voice at Judgement Day…but for others it will be the kind words, “Well done good and faithful servant.”