Pope John XXIII
Sacerdotii Nostri Primordia §45
St. John Vianney's Devotion to the Eucharist
45 The devotion to prayer of St. John M. Vianney, who was to spend almost the whole of the last thirty years of his life in Church caring for the crowds of penitents who flocked to him, had one special characteristic—it was specially directed toward the Eucharist.
Source: Sacerdotii Nostri Primordia (Vatican.va)