Article 3: He was conceived by the power of the Holy Spirit and was born of the Virgin Mary

The Son of God. . . worked with human hands; he thought with a human mind. He acted with a human will, and with a human heart he loved. Born of the Virgin Mary, he has truly been made one of us, like to us in all things except sin. ^{(CCC 470)}

From the Catechism of the Catholic Church:

The Annunciation to Mary inaugurates "the fullness of time",¹¹⁹ The time of the fulfilment of God's promises and preparations. Mary was invited to conceive him in whom the "whole fullness of deity" would dwell "bodily".¹²⁰ The divine response to her question, "How can this be, since I know not man?", was given by the power of the Spirit: "The Holy Spirit will come upon you."¹²¹ (CCC 484)

"The Blessed Virgin Mary continues to "go before' the People of God. Her exceptional pilgrimage of faith represents a constant point of reference for the Church, for individuals and for communities, for peoples and nations, and in a sense for all humanity" (Redemptoris Mater, n. 6). She is the star of the third millennium, just as, at the beginning of the Christian era, she was the dawn that preceded Jesus on the horizon of history. Mary, in fact, was born chronologically before Christ and gave birth to him, introducing him into our human events. (Pope John Paul II, General Audience March 21, 2001)

"The knot of Eve's disobedience was untied by Mary's obedience: what the virgin Eve bound through her disbelief, Mary loosened by her faith."¹⁴² (St. Irenaeus)