He said that the aim of Opus Dei is to help Christians to know that their ordinary life is a way to become a saint and to bring people close to God . And to those who truly understand this , Opus Dei gives them classes , talks , and other help so that they can practice this teaching . The bishop of Madrid where Opus Dei was born , Leopoldo Eijo y Garay , supported Opus Dei and defended it in the 1940s by saying that `` this opus is truly Dei '' ( this work is truly God 's ) .