Le Pelerinage de Lourdes §55

⁵⁵ Christians of every class and every nation will try to be of one mind in truth and charity, and to banish misunderstanding and suspicion. Without doubt, social structures and economic pressures of enormous weight burden the good will of men and often paralyze it. But if it is true, as Our predecessors and We Ourselves have insistently stressed, that the quest for social and political peace among men is, above all, a moral problem, then no reform can bear fruit, no agreement can be lasting without a conversion and cleansing of heart. In this jubilee year the Virgin of Lourdes reminds all men of this truth!