The purpose of this graduate thesis is to highlight the actual meaning of the theological thought of Johan Baptist Metz. The fundamental works we will deal with are the book Memoria Passionis and the article of the Universal Program of Christianity in the Age of Globalization. The first section emphasizes that suffering is reality, everyday life, and a major problem and is the greatest challenge for Christians. The suffering scares the man and confuses him and repels him from seeking God, but it should be borne in mind that every man in personal suffering can become a participant in the redeeming Christ's suffering. So, in Christian perception, suffering is interpreted as an evil that in some sense relates to some good. On that path, the second part brings the thoughts of Johannes Baptist Metz. It is important to emphasize that the theologian Metz distinguishes the memory of mourning from a mere recollection, not merely a remembrance that simply refers to history, to something that has been and what we remember, with the sadness and sorrow, joy and warmth; At memoriae passionis, we are talking about a dangerous memory that is existential in our battle, a memory that challenges our present and future. In the third part, we point out brief critical reviews regarding the book Memoria passionis and Theology of Johann Baptist Metz with the aim of making a second opinion. At the end of the paper, we bring the dimension of compassion we associate with the theme of mercy. Namely, mercy is the very foundation on which the Church's life rests. Overall, its passionate action should be worn by the gentleness it shows towards believers, nothing in its proclamation and its testimony to the world should be deprived of mercy.