2 The month of May, sacred in a special way to the Blessed Virgin Mother of God, is approaching. We again exhort all - but especially the very young and innocent children - to humbly entreat the divine Redeemer, through the intercession of Mary, that the peoples who have been forced into discord, contention, and all kinds of misery, may be able to breathe again after their long-lasting distress and sorrow. But since it is our sins which have turned us away from Him and have immersed us miserably in destruction, it is hardly enough to pour out many prayers to heaven; it is hardly enough to approach the altar of the Blessed Virgin to bring her an offering, flowers, and prayers. Additionally we must use Christian morals to renew both public and private life; in this way, we will lay a solid foundation on which a building of domestic and civil concord, not discord, and a strong, but not a tottering building, can stand. Let all remember those warnings of the sacred prophet and assimilate them in the conduct of their lives: "Turn to me, says the Lord of hosts, and I will turn to you". Also meditate upon those words of the most wise Bishop of Hippo: "Change the heart and the work will be changed. Eradicate cupidity and plant charity." "Do you want peace? Do justice, and you will have peace. Justice and peace kiss one another." If you do not love justice, you will not have peace, for these two love one another and kiss each other, so that if you practice justice, you will find peace kissing justice. . . . If therefore you desire to come to peace, do justice; avoid evil and do good. This is to love justice; and when you have already avoided evil and done good, seek peace and follow it."
Source: Communium Interpretes Dolorum (Vatican.va)