We particularly honor Mary, the Mother of Christ, because of her great role in God’s plan of salvation. She was closer to Christ than anyone else, particularly by her virginal conception and sinlessness and it was He who chose her for the great honor of being His mother. If she were the mother merely of a great man we would have some reason for honoring her, but not for paying her the honor we do – but if one believes that her Son is Divine, then it is only natural to honor her greatly. The fact that she is the Mother of God is the basis of our veneration of her.
To honor her is to honor God who made her what she is. Mary shows what God could do with any of us, if we but fully opened ourselves to Him.