Doctrine and Dogma
For the method of godliness consists of these two things, pious doctrines, and virtuous practice: and neither are the doctrines acceptable to God apart from good works, nor does God accept the works which are not perfected with pious doctrines. For what profit is it, to know well the doctrines concerning God, and yet be a vile fornicator? And again, what profit is it, to be nobly temperate, and an impious blasphemer? A most precious possession therefore is the knowledge of doctrines...
St. Cyril of Jerusalem (Catechetical Lectures: Lecture 4 no. 2)
Links From Orthodox Sources
The Doctrine of the Orthodox Church: The Basic Doctrines - Orthodox Information Center
The Dogmatic Tradition of the Orthodox Church - The Greek Archdiocese of America
I Believe; A Short Exposition on Orthodox Doctrine - Orthodox Christian Fellowship
Theology and Mysticism in the Tradition of the Eastern Church - by Vladimir Lossky
Rainbow Series on the Orthodox Faith Doctrine - by V. Rev Thomas Hopko, the Orthodox Church in America
The Orthodox Church -by Professor Constantine Scouteris, School of Theology of the University of Athens
Ways of Russian Theology - by Fr. George Florovsky
Excerpts from "Byzantine Theology," Historical trends and doctrinal themes - by John Meyendorff
THE DIDACHE, or Teaching of the Twelve Apostles, from St. Pachomius Library
The Orthodox Church By John Meyendorff - Online Google Text.
An Online Orthodox Catechism adopted from ‘The Mystery of Faith’ by Bishop Hilarion Alfeyev