A friend who thinks of the Roman Catholic Church as the oldest form of Protestantism recently asked, “Why should an Orthodox Christian be interested in Dan Berrigan?” He was slightly scandalized that I, a member of the Orthodox Church since 1988, had written a biography of this often-jailed Jesuit priest, At Play in the Lions’ Den.
The core of my answer is that every Christian, no matter what church or communion or sect he belongs to, should interest us to the extent that he or she has lived a Christ-shaped, Christ-revealing life. While no community of Christians has been more attentive to preserving the theology and liturgy of the first millennium as the Orthodox Church, we don’t have a monopoly on sanctity. Christ did not say it was by our excellent theology that his followers would be known, but by their fruits. All sanctity deserves our interest—our divisions should not blind us to holiness on the other side of our ecclesiastical borders. As I recall, it was Metropolitan Platon of Kiev who, in the 19th century, remarked: “The walls we build on earth do not reach to heaven.”
Source: Jim Forest - "Father Daniel Berrigan, SJ: Why Should an Orthodox Christian be Interested in Him?", Orthdoxy In Dialogue, 12 Dec 2017
https://orthodoxyindialogue.com/2017/12/12/father-daniel-berrigan-sj-why-should-an-orthodox-christian-be-interested-in-him-by-jim-forest/