2 We have long desired to secure the welfare of the human race in an increase of devotion to the Blessed Virgin, as in apowerful citadel, and We have never ceased to encourage the constant use of theRosary among Christians, by publishing every year since September 1, 1883, anEncyclical Letter on this subject, besides frequently issuing Decrees, as iswell known. And now, since God in His merciful Providence has this year againallowed Us to see the approach of the month of October, which We have alreadyconsecrated to our Heavenly Queen under the title of the Rosary, We would notrefrain from again addressing you; but summarizing in a few words all that wehave hitherto done for the promotion of his form of prayer, We will crown ourwork by yet a new document, in which Our earnest desire and zeal for this formof devotion to Mary may appear still more clearly, and the fervour of the faithful may bestimulated to the devout and constant use of this pious practice.
Source: Diuturni Temporis (Vatican.va)