While the period of the seven Ecumenical Councils possesses a preeminent importance for Orthodoxy, we are not for one moment to imagine that the “age of the Fathers” came to a close in the eighth century. On the contrary, the Patristic era is open-ended. There is no reason, apart from human sin, why there should not be in the third millennium further Ecumenical Councils and new Fathers of the Church, equal in authority to those in the early Christian centuries; for the Holy Spirit continues present and active in the Church as much today as ever He was in the past.
Bishop Kallistos (Ware), Strange Yet Familiar: My Journey to the Orthodox Church