Christ and Mary

The Ecumenical Councils of the first millennium defined the basic Christian doctrines on the Trinity, on the unique Person of Christ, and the two natures of Christ and on his two wills (ie..expressing fully the authenticity and fullness of his divinity and his humanity). These doctrines are forcefully expressed in all Orthodox statements of faith and in liturgical hymns. Also, in light of this traditional doctrine on the Person of Christ, the Virgin Mary is venerated as the Theotokos (Greek ie.. God-bearing Vessel, Mother of God). 

Roman Catholic developments regarding Saint Mary, however, such as the idea of the conception of Mary as immaculate, are foreign to Orthodoxy. Saint Mary's intercession is invoked because she was closer to our Saviour than anyone else and is therefore, the greatest representative of fallen humanity, and the most prominent, and holiest member of the Church.

Celibacy

Orthodox canonical legislation admits married men to the priesthood. Most priests serving in parishes are married. Bishops, however, are elected from among monastic, celibate, or widowed clergy.