Divinum Illud Munus §12

¹² Such, Venerable Brethren, are the teachings and exhortations which We haveseen good to utter, in order to stimulate devotion to the Holy Ghost. We have nodoubt that, chiefly by means of your zeal and earnestness, they will bearabundant fruit among Christian peoples. We Ourselves shall never in the futurefail to labour towards so important an end; and it is even Our intention, inwhatever ways may appear suitable, to further cultivate and extend thisadmirable work of piety. Meanwhile, as two years ago, in Our Letter ProvidaMatris , We recommended to Catholics special prayers at the Feast of Pentecost,for the Re-union of Christendom, so now We desire to make certain furtherdecrees on the same subject.