A plenary indulgence (the forgiveness of all temporal
punishment resulting from sins that have already been confessed) is granted on
the Feast of Divine Mercy if to all the faithful who go to Confession, receive Holy Communion, pray for the intentions of the Holy Father,
and "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!')."
A partial indulgence (the remission of some temporal
punishment from sin) is granted to the faithful "who, at least with a contrite
heart, pray to the merciful Lord Jesus a legitimately approved
invocation."