IT IS ON ACCOUNT OF HER DIVINE SON THAT WE HONOR MARY: When the Holy Ghost, by the mouth of Elizabeth, said: "Blessed art thou among women, and blessed is the fruit of thy womb (Jesus)", He testified to the close connexion that lies between the veneration of the Mother and the worship of the Son. It is because Mary is the Mother of God that she is so full of grace, and entitled to the love and veneration of all who love and worship Jesus; and all the honor which we pay to her, returns to her Divine Son. On the other hand, those who despise and depreciate Mary depreciate thereby our Lord Jesus Christ. The Church has added St. Elizabeth's words (Blessed is the fruit of thy womb) to the Angelical Salutation, to prove that the veneration of Mary is inseparable from the veneration and worship of Jesus Christ.
[From 'A Practical Commentary on Holy Scripture' by Bishop Knecht, D.D.]