From Volume 2 October 3, 1899:

…I commended a sick person to Him, and Jesus showed His wounds, which that sick person had given to Him. I tried to pray Him, to placate Him, to repair Him, and it seemed that those wounds would heal. And Jesus, all benignity, told me: “My daughter, today you have performed for Me the office of a most skillful doctor, for you have tried not only to medicate and to bandage the wounds which that sick person gave to Me, but also to heal them. So I feel very much soothed and placated.” Then I understood that by praying for the sick, one comes to perform the office of doctor for Our Lord, who suffers in His very images.