Closely related to devotion to the Sacred Heart of Jesus, I think, is devotion to the Divine Mercy. I always laughed off this devotion, almost literally, up until recently. I don't know why. Part of it was rebellion, since it was my mom's attempt to get us to pray as a family. Part of it probably had to do with my association of the devotion with charismatic renewal members or Medjugorje fans (I am fairly sure this is how my mom found out about in while we were in Virginia.).
Anyways. I love the Chaplet of Divine Mercy. One can easily say it before or after saying the Rosary. It's beautiful. We are sinners who have done wrong before God, and in His excessive justice has given us His Only-Begotten Son, the Incarnate logos, who by His Passion, the supreme sacrifice of Love has purchased for us the rewards of eternal life. Our Lord came completely outside of Himself and became fully Man so that by the flood of grace He opened up with the Blood and Water flowing from His side, from the Most Sacred Heart, we might share eternity with the Most Holy Trinity.
Our Holy Father, Pope Francis, does not often use the word 'love,' a buzzword for liberal Catholics who don't understand what love is. Francis sees this divine love, charity, in action, which to my ears is mercy: to will the good of another for God's sake is love. Therefore, when Our Lord loves us and brings us to Himself, for no reason that we can provide, He is being merciful. His motto is difficult to translate, but it is from the commentary of the Venerable Bede on the calling of Matthew. Francis in short desires to imitate the mercy of Our Lord.
I found another chaplet while making a Holy Hour on campus. Someone left a prayer card with this devotion to Mary, Mother of Divine Mercy on the card. It's wonderful, since I love the Divine Mercy and Mary under the title of Mediatrix of All Graces, Co-Redemptrix, and Advocate. My favorite part of the Salve Regina is "Mater Misericordiae, vita, dulcedo, et spes nostra salve..."
The Chaplet of Our Lady of Divine Mercy was approved in the 1980s by the auxiliary bishop of Warsaw and translated into English by the 1990s.
Begin with the Sign of the Cross and then the Hail Holy Queen. On the Our Father beads of the Rosary, say, "Mary, Mother of all graces, Mother of Divine Mercy, defend us from our enemies and receive us at the
hour of our death.."
On the Hail Mary beads, say, "Mary, Mother of Mercy, implore for us mercy of your son." I think the article is missing...but oh well.
Close with, "You open your arms to us most merciful Mother, and stretch out your hands, full of mercies and gifts. Your Mother's heart is restless to endow us with everything we need. Encouraged by your goodness, we have confidence in you. We beg you to intercede for us. Mother obtaining for us all we need. Through your most powerful intercession, obtain from God especially the gift of chastity and innocence, and foster in our heart truly childlike love for you. So that we may bear the image of the Sacred Heart of your Son, may the Sacred Heart defend us, guide us, and take us to eternal light. Amen." and the Sign of the Cross.