During those days Mary set out and travelled to the hill country in haste to a town of Judah, where she entered the house of Zechariah and greeted Elizabeth. When Elizabeth heard Mary's greeting, the infant leaped in her womb, and Elizabeth, filled with the holy Spirit, cried out in a loud voice and said, "Most blessed are you among women, and blessed is the fruit of your womb. And how does this happen to me, that the mother of my Lord should come to me?For at the moment the sound of your greeting reached my ears, the infant in my womb leaped for joy. Blessed are you who believed that what was spoken to you by the Lord would be fulfilled."
"Therefore it is an excellent and fruitful custom of holy Church that we should sing Mary’s hymn at the time of evening prayer. By meditating upon the incarnation, our devotion is kindled, and by remembering the example of God’s Mother, we are encouraged to lead a life of virtue. Such virtues are best achieved in the evening. We are weary after the day’s work and worn out by our distractions. The time for rest is near, and our minds are ready for contemplation."St Bede the Venerable - from today's Office of Readings