There’s a wealth of significance to meditate upon in the 3rd joyful mystery, like the scorn and rejection Mary and Joseph endured in Bethlehem, the poverty of the stable wherein God came into the world, Mary’s high contemplation and surpassing love at the moment of the birth if our Lord, the Eternal Word’s departure from the womb of Mary while maintaining her virginity, the angel’s adoration and hymnody at the birth of Jesus Christ, the captivating beauty of Christ’s Divine Infancy, the coming of the shepherds to the stable with their small presents, the circumcision of Christ and His Affectionate pains, the imposition of the Name of Jesus and the Name’s grandeur, the adoration of the Magi kings and the their gifts, the fact of Jesus being born as a man, the Son of Mary, assuming the human nature and body, the fact of the Holy Ghost and Mary by God bringing the world to Jesus, etc.
Quite a profound mystery.