The mystery of the Incarnation: Revealing God's identity: He is faithful to fulfilling what he promised through the prophet Isaiah, who can see in Emmanuel, who will be born of a virgin, the blessing for the people. This great mystery is what we are celebrating now, so it is not limited to a single day, 25 December, because it is a whole history of salvation. Catechesis on the Church, the family and development, in collaboration with Fr Bertrand Ratovoalinirina.