The venerated image under this Christological title refers to what Saint Faustina's diary describes as God's loving mercy towards all people, specifically for sinners. Saint Faustina was granted the title "Secretary of Mercy" by the Holy See in the jubilee year of 2000.
Saint Faustina reported a number of apparitions during religious ecstasy that she wrote in her journal, later published as the book Diary: Divine Mercy in My Soul.
The two main themes of the devotion are:
- to trust in Christ's endless goodness, and;
- to show mercy to others acting as a vehicle of God's love towards them.
Pope John Paul II, a native of Poland, had a great affinity towards this devotion and authorized it in the liturgical calendar of the Ancient Rome Catholic Church. The liturgical Feast of the Divine Mercy is celebrated on the first Sunday after Easter.
Worshippers of the Divine Mercy memorialize hour of Mercy, which according to Saint Faustina's diary is the time of the death of Jesus - 3:00 P.M.
Another very popular form of devotion is the Chaplet of the Divine Mercy.