Sunday of Orthodoxy
Today hath appeared, a day full of joy, because the splendor of true doctrine shineth forth brilliantly, and the Church of Christ now sparkleth, adorned by the elevation of the Icons of the saints and their illustrating pictures, and believers attain there a unity rewarded of God.
+ Orthros of the Feast, Tone 4
On the first Sunday in Lent, we commemorate the decision of the Seventh Ecumenical Council in 787 A.D. upholding the use of holy icons in Orthodox worship. We also commemorate today the unity of Orthodox belief and the oneness of our Faith—across languages, continents, and centuries.
Read more about the Orthodox theology of icons
Listen to Fr. Thomas Hopko on the Triumph of Orthodoxy
As the prophets beheld, as the Apostles have taught,... as the Church has received... as the teachers have dogmatized,... as the Universe has agreed,... as Grace has shown forth,... as Truth has revealed,... as falsehood has been dissolved,... as Wisdom has presented,... as Christ Awarded,... thus we declare,... thus we assert,... thus we preach Christ our true God, and honor as Saints in words, in writings, in thoughts, in sacrifices, in churches, in Holy Icons; on the one hand worshipping and reverencing Christ as God and Lord; and on the other hand honoring as true servants of the same Lord of all and accordingly offering them veneration.
This is the Faith of the Apostles, this is the Faith of the Fathers, this is the Faith of the Orthodox, this is the Faith which has established the Universe.
-- Confession of faith of the Day of Orthodoxy