Following the Early Christians
The Prelate of Opus Dei, Bishop Javier Echevarría, has written a letter to the faithful which you can find online. In it he urges the faithful to consider the ordinary but exemplary life of the first Christians.
To explain Opus Dei’s mission, St. Josemaría often turned to those first sisters and brothers of ours in the faith. If you want a point of comparison, he would say, the easiest way to understand Opus Dei is to consider the life of the early Christians. They lived their Christian vocation seriously, seeking earnestly the holiness to which they had been called by their Baptism. Externally they did nothing to distinguish themselves from their fellow citizens. Similarly, he added, the faithful of Opus Dei are ordinary people. They work like everyone else and live in the midst of the world just as they did before they joined. There is nothing false or artificial about their behavior. They live like any other Christian citizen who wants to respond fully to the demands of his faith, because that is what they are.