9 But human efforts are ineffective unless strengthened by Divine Grace. We exhort you, therefore, Venerable Brethren, to begin a veritable crusade of prayer among your faithful to implore from the Father of Mercies and the God of Consolation (2 Cor . i. 3) suitable remedies for the present evils. We intensely desire that, united with Us, they offer public prayers on March 26th Passion Sunday, when the sacred rites of the Church begin to commemorate the bitter sufferings by means of which the Divine Redeemer liberated us from slavery to the demon and led us back to the freedom of the sons of God. It is Our intention on that day to descend into the Basilica of St. Peter to unite Our prayers not only with those present but - as We hope - with those of the whole Catholic world. Let those who, because of illness or old age or other reasons, cannot come to church, offer to God with humble and trusting heart their sufferings and their fears so that the prayer of all, the yearning of all and the wish of all may be one.
Source: Anni Sacri (Vatican.va)