Although St. Benedict flourished two hundred years after the Council of Nicea, his Rule is nonetheless imbued with its spirit. Arianism was still a force to be reckoned with at his time. The spirit of the Council of Nicea can be seen all over the Rule, in its Christocentrism, and its veneration for the “orthodox catholic fathers” (i.e. the anti-Arian writers). Sometimes the spirit of the council leads St. Benedict into unexpected interpretations of Sacred Scripture. Thus, in chapter 2, on the character of the abbot, St. Benedict gives a startling interpretation of Romans 8:15:
A abbot who is worthy to preside over a monastery ought always to remember what he is called and to justify his title by his deeds. For he is deemed in the monastery the vicar of Christ, since it is by His [Christ’s] title he is addressed, for the Apostle says: “Ye have received the Spirit of adoption of sons in which it is we cry out Abba, Father.”
The cry “Abba, Father” is here taken to be directed at Christ, and the old monastic title of ‘abbot’ is interpreted Christologically. It is a very daring reading of Paul, and I don’t think it would have occurred to anyone before Nicea.