The first Office and Mass of the Sacred Heart were composed by St. John Eudes, but the institution of the feast was a result of the appearances of our Lord to St. Margaret Mary Alacoque in 1675. The celebration of the feast was extended to the general calendar of the Church by Pius IX in 1856.
O most holy heart of Jesus, fountain of every blessing, I adore you, I love you, and with lively sorrow for my sins I offer you this poor heart of mine. Make me humble, patient, pure and wholly obedient to your will. Grant, Good Jesus, that I may live in you and for you. Protect me in the midst of danger. Comfort me in my afflictions. Give me health of body, assistance in my temporal needs, your blessing on all that I do, and the grace of a holy death. Amen.