194 Saint Margaret Mary recounted that, in one of Christ’s appearances, he spoke of his heart’s passionate love for us, telling her that, “unable to contain the flames of his burning charity, he must spread them abroad”. Since the Lord, who can do all things, desired in his divine freedom to require our cooperation, reparation can be understood as our removal of the obstacles we place before the expansion of Christ’s love in the world by our lack of trust, gratitude and self-sacrifice.
Source: Dilexit Nos (Vatican.va)