The Sacred Heart: Yesterday and Today by Arthur R. McGratty, S.J., is an exploration of the history and spirituality of the devotion to the Sacred Heart of Jesus. It explains how this devotion was developed in the Middle Ages by saints such as St. Bernard and St. Bonaventure. It highlights the apparitions of Jesus to St. Margaret Mary Alacoque and the role of St. John Eudes in spreading it. Its purpose is to invite readers to reflect on the message of cor ad cor loquitur (heart speaking to heart) to rediscover the warmth of divine love.