The Plenary Indulgence (complete forgiveness of sins and punishment due to sin)
This Sunday, April 11, is Divine Mercy Sunday. Jesus told St. Faustina in a private apparition that this Feast of Mercy would be a very special day when “all the divine floodgates through which graces flow are opened” (Diary 699). Jesus promised that “The soul that will go to Confession and receive Holy Communion shall obtain the complete forgiveness of sins and punishment”(Diary 699). He went on to say “I want to grant a complete pardon to the souls that will go to Confession and receive Holy Communion on the Feast of My Mercy” (Diary 1109).
This plenary indulgence (the complete forgiveness of sins and punishment due to sin) is granted under the usual conditions (sacramental confession, Eucharistic communion and prayer for the intentions of Supreme Pontiff) to the faithful who, on the Second Sunday of Easter or Divine Mercy Sunday, in any church or chapel, in a spirit that is completely detached from the affection for a sin, even a venial sin, take part in the prayers and devotions held in honor of Divine Mercy, or who, in the presence of the Blessed Sacrament exposed or reserved in the tabernacle, recite the Our Father and the Creed, adding a devout prayer to the merciful Lord Jesus (e.g. Merciful Jesus, I trust in you!). It is allowed for one to go to Confession up to about 20 days before or after Divine Mercy Sunday to receive this plenary indulgence.
The Chaplet of Divine Mercy
In 1935 St. Faustina Kowalska was inspired by God to pray the prayer that is now known as the Chaplet of Divine Mercy. It is especially appropriate after receiving Holy Communion. Jesus specifically told St. Faustina to pray it during the nine days before Divine Mercy Sunday. It is also very appropriate to pray the Chaplet at 3 PM in the afternoon. Please check out these links for more information about the Divine Mercy Chaplet and to pray along with it.
Pray Along with the Divine Mercy Chaplet | Franciscan Friars of the Renewal
Fr. Mike explains: Which Is Better? The Rosary vs. The Chaplet (Fr. Mike Schmitz)
For a very short explanation of the prayer: Divine Mercy Chaplet Explained (St Faustina) – Catholic Video by Speaker Ken Yasinski
A good description of how to pray the chaplet from the USCCB: