The message of Divine Mercy as communicated through Sister Faustina is both a starting point and a recurring theme for Cardinal Schonborn's discussion of God's merciful love. The Archbishop of Vienna explores the presence of God's great mercy in the Scriptures, Tradition, the life of Christ, and the sacraments and works of the Church while raising important questions along the way, such as, What is the relationship between mercy and justice? Mercy is the central nucleus of the Gospel message.

In our time humanity needs a strong proclamation and witness of God's mercy . . . Go forth and be witnesses of God's mercy, a source of hope for every person and for the whole world. -- Pope Benedict XVI