History of Sacred Heart devotion in the Church
"In the eleventh and twelfth centuries we find the first indications of devotion to the Sacred Heart. It was the Benedictine or Cistercian monasteries, in the world of Anselmian or Bernardine that the devotion began. We cannot state with certainty to whom we are indebted for the "Vitis mystica". Until recent times its authorship had generally been ascribed to Saint Bernard but the publishers of the Quaracchi edition attributed it to Saint Bonaventure. Saint Gertrude on the feast of Saint John the Evangelist laid her head near the wound in the Saviour's side and heard the beating of the Divine Heart. She asked John if he had felt these pulsationson the night of the Last Supper and why he had never spoken of this experience. John replied that this revelation had been reserved for subsequent ages when the world, having grown cold, would have need of it to rekindle its love. ("Legatus divinae pietatis", IV, 305; "Revelationes Gertrudianae", ed. Poitie...