The Orthodox Church is the true Church of God on earth and maintains the fullness of Christ’s truth in continuity with the Church of the apostles. This awesome claim does not necessarily mean that Orthodox Christians have achieved perfection; for we have many personal shortcomings. Nor does it necessarily mean that the other Christian churches do not serve God’s purposes positively; for it is not up to us to judge others but to live and proclaim the fullness of the truth.
But it does mean that if a person carefully examines the history of Christianity he or she will soon discover that the Orthodox Church alone is in complete sacramental, doctrinal and canonical continuity with the ancient undivided [New Testament] Church.
Fr. Theodore Stylianopoulos