20 Henceforth, it seems that the faithful can with greater and better reason turn their minds and hearts to the mystery of the Immaculate Conception. For the two dogmas are intimately connected in close bond. And now that the Assumption of the Virgin Mary into Heaven has been promulgated and shown in its true light - that is, as the crowning and complement of the prior privilege bestowed upon her - there emerge more fully and more clearly the wonderful wisdom and harmony of the Divine plan, by which God wishes the most blessed Virgin Mary to be free from all stain of original sin.
Source: Fulgens Corona (Vatican.va)