(Title in Polsh - 'Boze milosierdzie w doswiadczeniu sw. Faustyny Kowalskiej i w teologii bl. ks. Michala Sopocki - dynamika przyjazni duchowej'). Rev. Michal Sopocko, the father confessor to Sister Faustyna Kowalska, played an important role in promoting the cult of Divine Mercy. Both of them made people sensitive to God's love anew. According to John Paul II, those who experience it in everyday life, should guide themselves with the imagination of mercy, especially in interpersonal contacts. Divine Mercy should be the foundation of the social order, as it is the only guarantee of happiness.