Unlike the Catholic Church there is no teaching Magisterium in the Orthodox world. Most catechumens are instructed orally by a deacon or priest at the church. Also, there is more emphasis on being taught by simply being in church, and listening to the services. Most Orthodox would refer back to the original writings of the Church Fathers, including the Catechetical Lectures of St. Cyril of Jerusalem and The Ladder of Divine Ascent. New catechumens would generally be encouraged to read "The Orthodox Church" by Kallistos Ware to get an overview of the Christian faith from an Orthodox perspective before being given more advanced readings.
