▁shr ines ▁in ▁the ▁world ". ▁P ius ▁XII ▁rec alls ▁his ▁own ▁previous ▁en cyc lic al , ▁in ▁which ▁he ▁wrote ▁about ▁L our des ; ▁" The ▁B less ed ▁Virgin ▁Mary ▁herself ▁wanted ▁to ▁confirm ▁by ▁some ▁special ▁sign ▁the ▁definition ▁which ▁the ▁Vic ar ▁on ▁earth ▁of ▁her ▁Div ine ▁Son ▁had ▁pron ounced ▁amid st ▁the ▁vig orous ▁appro b ation ▁of ▁the ▁whole ▁Church . ▁▁ ▁The ▁challenge ▁of ▁material ism ▁The ▁second ▁part ▁of ▁the ▁en cyc lic al ▁de als ▁with ▁conversion , ▁specifically ▁a ▁Marian ▁conversion ▁of ▁heart ▁and ▁society . ▁The ▁Virgin ▁inv ites ▁to ▁the ▁conversion ▁of ▁hearts ▁and ▁the ▁hope ▁of ▁forg iveness . ▁Ind ividual ▁conversion ▁is ▁not ▁enough . ▁The ▁Pope ▁appe als ▁for ▁Christian ▁renew al ▁of ▁society ▁in ▁answer ▁to ▁Mary ' s ▁appeal . ▁ ▁Definition ▁The ▁root ▁of ▁the ▁evil ▁according ▁to ▁P ius ▁XII , ▁is ▁a ▁terrible ▁tempt ation ▁to ▁material ism . ▁This ▁is ▁not ▁conf ined ▁to ▁material istic ▁( Mar x ist ) ▁philosophy . ▁It ▁exists ▁also ▁as ▁" a ▁love ▁of ▁money ▁which ▁creates ▁ever ▁greater ▁hav oc , ▁as ▁modern ▁enter pr ises ▁expand , ▁which , ▁unfortunately , ▁determ ines ▁many ▁of ▁the ▁dec isions ▁which ▁we igh ▁heavy ▁on ▁the ▁life ▁of ▁the ▁people . ▁It ▁finds ▁expression ▁in ▁the ▁cult ▁of ▁the ▁body , ▁in ▁excess ive ▁desire ▁for ▁comfort s , ▁a ▁flight ▁from ▁all ▁the ▁a uster ities ▁of ▁life ,