Saint Pope John Paul II. declared the first Sunday after Easter as the Feast of the Divine Mercy, according to instructions given by the Lord to saint Faustyna.
The diary is made up of six note books in which Faustyna wrote down some of her spiritual experiences and dialogues with Jesus. She offered all her sufferings for sinners and dying people. She was also often visited by the souls of the dying or poor souls in purgatory and prayed for their salvation.
The diary is not a book you read in one night, but it will help the reader make great progress in their religious understanding.