Roman Catholics observe June as the month of the Sacred Heart of Jesus, in veneration and in gratitude for Jesus’ merciful heart and His redeeming love for mankind.

Special masses, novenas, and the recitation of devotional prayers are traditionally observed in honor of the Sacred Heart of Jesus. Devotion to the Sacred Heart is one of the most widely practiced and well known Catholic observances.
The Congregation of the Sacred Hearts of Jesus and Mary said, devotion to the Sacred Heart “is an expression of our faith in Jesus Christ’s merciful heart and our way to express our gratitude for His redeeming mercy and love.”
Characteristic acts of devotion include almsgiving, consecration, and reparation.
St. Margaret Mary Alacoque (1647-1690), a French Catholic nun, was instrumental in spreading devotion to the Sacred Heart after she had visions of Jesus beginning in 1673, when Jesus asked her to have a special feast established in honor of His Sacred Heart.
Jesus also gave her instructions on how the faithful can offer sacrifices in reparation for the offenses inflicted on His Sacred Heart such as receiving Holy Communion every first Friday of the month, observing an hour vigil every Thursday night in memory of His agony in the Garden of Gethsemane, and celebrating the Feast of the Sacred Heart every year. This year, the Solemnity of the Sacred Heart will be observed on June 11.