The theme of mercy is studied from what is presented in Walter Kasper s book Mercy-The essential condition of the Gospel and the Key to the Christian Life with elements for deepening the knowledge to God s mercy in the Scriptures, in the teaching and in the life at Church, and its action within the Church and in the world. Together with Kasper s study, the thesis seeks to verify the teaching of Pope Francis by year during Jubilee extraordinary of Mercy. See the deepening of mercy in the main section of the Pope s hearings in this jubilee. The dissertation highlights elements of Kasper s book and emphases of the teaching of Pope Francis with pontifical texts in the jubilee year, as in the Bull Misericordiae Vultus that the year of mercy was opened and the apostolic letter Misericordia and Misera closing the jubilee year. In Kasper and Francis are presented important questions for the action of the Christian in the world. Scripture shows the mercy of God. Mercy is in the saving work of God. Mercy must be in the faith and life of Christians. The dialogue of mercy will be necessary to bring the action of God s mercy to a culture of mercy and to the evangelization of the world. The Church must receive the mercy of God and proclaim with words and works of mercy and the sacraments. Within this framework, attention will need to be paid, among other things, the sacrament of reconciliation where one encounters the forgiveness and the mercy of God.