St. John Eudes united devotion to Mary with devotion to her Son, Jesus Christ. For Eudes, the hearts of Jesus and Mary are inseparable. He recognized that the union of their two hearts is the most intimate union that ever existed. The heart of Jesus dwells in his Mother’s heart, forming a perfect union of the two hearts as one mystical heart. Eudes promoted the Feast of the Admirable Heart of Mary and the Feast of the Sacred Heart of Jesus in order to express the mystical union of the two hearts.
"Theological Foundations for Devotion to the Hearts of Jesus and Mary According to St. John Eudes (1601-1680),"
Vol. 67, Article 8, Pages 193-208.
Available at: https://ecommons.udayton.edu/marian_studies/vol67/iss1/8