5 Our esteemed Predecessor, Benedict XV, referring to the five saints We have spoken of, also made mention of the approaching Centenary of the death of Francis de Sales and expressed the hope of writing particularly of him in an encyclical addressed to the whole world. Gladly We will try to fulfill this as well as the other wishes of Our Predecessor, for We look upon them as a sacred heritage left Us by him. In this particular matter We follow his desires all the more willingly since We expect from this Centenary no less marvelous fruits than those which accompanied the feasts which have preceded it.
Source: Rerum Omnium Perturbationem (Vatican.va)