34 Let this letter, Venerable Brethren, be a token to you of Our fatherly love as the Feast of the Nativity of Our Lord Jesus Christ draws near; and receive the Apostolic Benediction as a pledge of divine blessings, which with loving heart, We impart to you, Venerable Brethren, to your clergy, and to your people. Given at St. Peter's Rome, on the eleventh day of the month of December, in the Holy Year 1925, the fourth of Our Pontificate.
Source: Quas Primas (Vatican.va)