For this reason , the Western version of the prayer is not derived from the Greek version : even the earliest Western forms have no trace of the phrases `` Mother of God and Virgin '' and `` for thou hast given birth to the Saviour of our souls '' , which are part of the Greek version . The Western version of the prayer is thus not derived from the Greek version : even the earliest Western forms have no trace of the Greek version 's phrases : `` Mother of God and Virgin '' and `` for thou hast given birth to the Saviour of our souls '' .