In his Angelus address for the feast of the Immaculate Conception on Monday, Pope Francis said because everything we have received is "a gift freely given by God," we too must "become a gift for others."

"The message of today's feast of the Immaculate Conception of the Virgin Mary," the Pope said at St. Peter's Square, can be summarized as follows: "Everything is a gift freely given by God, everything is grace," and everything is given because "of his love for us."

The feast of the Immaculate Conception, commemorated annually on Dec. 8, is the day in which the Church celebrates Mary having been conceived without original sin.

Pope Francis reflected on the Gospel account of the Annunciation, during which Gabriel declares Mary to be "full of grace."

"In her there was no room for sin," he said, for "God had chosen her (from the beginning) to be the mother of Jesus," thus preserving her from "original sin."

The Holy Father noted Mary's receptivity to grace, and her abandonment to the words of the Angel: "Be it done unto me according to your word."

"She did not say 'I will act according to your word': no! Rather: "Be it done unto me..."

Mary's response, Pope Francis said, shows "that we must abandon ourselves to God" in order to truly be conformed "to his will."

"Mary is receptive, but not passive," he said. "On a physical level, she receives the power of the Holy Spirit, but then gives (her) flesh and blood to the Son of God who is formed within her. Therefore, on a spiritual level, she welcomes the Grace and conforms to it with faith."

Pope Francis went on to stress that "salvation is a gift" freely given by God, which we in turn "are called to freely give."  

This call to give what has been received, he said, is in "imitation of Mary who, soon after having heard the announcement of the Angel, went to share the gift of fruitfulness with her relative Elizabeth."

"The Spirit is given to us and we, with the strength of the Spirit, must become a gift for others," he said, allowing "the Holy Spirit to make us instruments of welcome, instruments of reconciliation, instruments of forgiveness."

After leading the crowds in the recitation of the Angelus, Pope Francis told the crowds of "pilgrimage"  later in the afternoon to Rome's Piazza di Spagna where he would venerate the statue of the Immaculate Conception.

"I ask you to spiritually unite yourselves to me in this pilgrimage, which expresses filial devotion to our Heavenly Mother."

Later in the afternoon, Pope Francis paid a visit to the Basilica of Saint Mary Major where he venerated the Salus Populi Romani, an image of Mary which holds special significance to the people of Rome.

Afterward, per the tradition set by his predecessors, Pope Francis visited the statue of the Immaculate Conception. The statue of Our Lady, which rests atop a 40 foot-high pillar, was erected in 1857 to commemorate Bl. Pius IX's proclamation of the doctrine that Mary was conceived without original sin.

Earlier in the day, a large wreath had been hung on the statue's arm, and flowers at the column's base, in preparation for the Holy Father's visit.

Following the recitation of a reading from Revelation, Pope Francis read aloud a prayer to Our Lady, invoking her to "give life" to the hope which comes from evil's powerlessness against her.

"The power of God's love, which has preserved you from Original sin, free all of humanity through your intercession from every spiritual and material slavery, and make the designs of God's salvation victorious within hearts and events."

In the days leading up to Christmas, Pope Francis called on Mary to "teach us to go against the tide, to deprive, debase, give of ourselves, to listen, to be silent, to decentralize ourselves, in order  to leave space for the beauty of God, the source of all true joy."