The book shows the figure of the Blessed John Paul II in the context of the message of God's mercy. It contains the most important papal texts about the Divine Mercy, shows the importance and timelessness of St. Sister Faustina Kowalska message. "Message of the Divine Mercy was always close to my heart. It has been a very particular support to me and an inexhaustible source of hope not only for Krakow citizens, but for the entire nation. This was also my personal experience that I took with me to the Holy See, which in a certain way was a characteristic of this pontificate. I thank Divine Providence that I was able to personally contribute to the fulfillment of Christ's will by establishing the Feast of Divine Mercy.