33 Relying on this hope, to each of you Venerable Brethren, to the entire flock entrusted to your care, and to the whole family of monks which glories in this law-giver as master and parent, We impart, with great affection as a token of heavenly grace and a testimony of Our goodwill, the Apostolic Benediction. Given at Rome, at St. Peter's, on the feast of St. Benedict, the twenty-first day of March, in the year 1947, the ninth of Our Pontificate.
Source: Fulgens Radiatur (Vatican.va)