Pope John XXIII
Sacerdotii Nostri Primordia §46
St. John Vianney's Devotion to the Eucharist
46 It is almost unbelievable how ardent his devotion to Christ hidden beneath the veils of the Eucharist really was. "He is the one"—he said—"Who has loved us so much; why shouldn't we love Him in return?" (59) He was devoted to the adorable Sacrament of the altar with a burning charity and his soul was drawn to the sacred Tabernacle by a heavenly force that could not be resisted.
Source: Sacerdotii Nostri Primordia (Vatican.va)