- In a private audience with Marmion at the Vatican, Pope Benedict referred to Christ, the Life of the Soul, commenting, "It is a great help to me in my spiritual life." At another time he recommended Marmion's work to a visiting archbishop: "Read this–it is the pure doctrine of the Church." Thibaut, p. 353.
- Pope Pius XII stated that the works of Marmion were "outstanding in the accuracy of their doctrine, the clarity of their style, and the depth and richness of their thought." Toups, p. 160, note 4.