The Feast of Candlemas(Purification of Mary) marks the end of the feasts included in the Christmas cycle of the Liturgy.  It is perhaps the most ancient festival of our Lady.  It commemorates not only the obedience of the Blessed Virgin to the Mosaic Law in going to Jerusalem forty days after the birth of her Child and making the accustomed offerings, but also the Presentation of our Lord in the Temple, and the meeting of the Infant Jesus with the old man Simeon - the Occursus Domini, as the feast was anciently termed.  This is the principal theme of the liturgy on this day: Jesus is taken to the Temple "to present Him to the Lord."  So the Lord comes to His Temple, and is met by the aged Simeon with joy and recognition.

The procession of this feast is one of the most picturesque features of the Western Liturgy.  The blessing and distribution of candles, to be carried lighted in procession, precedes the Mass - a symbolic presentation of the truth proclaimed in the Canticle of Simeon:  our Lord is the "Light for the revelation of the Gentiles."  The anthems sung during this procession will express the joy and gladness of this happy festival, and the honor and praise we give to our blessed Lady and her Divine Son by its devout observance.
                      From the Roman Catholic Daily Missal, 1962