Conversion is a fundamental requirement of the preaching of Jesus and of the first Christian catechesis. Saint Paul develops a rich theology on conversion, although in his writings only the biblical terms that usually express that idea appear on rare occasions. Through an original theological grammar -ric in images and marked by his personal experience on the road to Damascus-, the Apostle shows how conversion constitutes the permanent structure of Christian existence, a Trinitarian gift initiated in baptism that is also a permanent and vital task of the baptized