A.T. Robertson Commentary Luke 1:45

"And blessed [is] she that believed; for there shall be a fulfilment of the things which have been spoken to her from the Lord." — Luke 1:45 (ASV)

For (οτ). It is not certain whether οτ here is "that" or "because." It makes good sense either way. See also 7:16. This is the first beatitude in the New Testament and it is similar to the last one in the Gospels spoken to Thomas to discourage his doubt (John 20:29). Elisabeth wishes Mary to have full faith in the prophecy of the angel. This song of Elisabeth is as real poetry as is that of Mary (1:47-55) and Zacharias (1:68-70). All three spoke under the power of the Holy Spirit. These are the first New Testament hymns and they are very beautiful. Plummer notes four strophes in Mary's Magnificat (46-48,49,50, 51-53,54,55). Every idea here occurs in the Old Testament, showing that Mary's mind was full of the spiritual message of God's word.