Le Pelerinage de Lourdes §58

⁵⁸ The Immaculate Virgin, who knows the secret ways by which grace operates in souls and the silent work of this supernatural leaven in this world, knows also the great price which God attaches to your sufferings united to those of the Savior. They can greatly contribute, We have no doubt, to this Christian renewal of society which We implore of God through the powerful intercession of His Mother.