“We cannot assert that Scripture is self-sufficient; and this is not because it is incomplete, or inexact, or has any defects, but because Scripture in its very essence does not lay claim to self-sufficiency. . . . If we declare Scripture to be self-sufficient, we only expose it to subjective, arbitrary interpretation, thus cutting it away from its sacred source. Scripture is given to us in tradition. It is the vital, crystallising centre.
The Church, as the Body of Christ, stands mystically first and is fuller than Scripture. This does not limit Scripture, or cast shadows on it. But truth is revealed to us not only historically. Christ appeared and still appears before us not only in the Scriptures; He unchangeably and unceasingly reveals Himself in the Church, in His own Body.
In the times of the early Christians the Gospels were not yet written and could not be the sole source of knowledge. The Church acted according to the spirit of the Gospel, and, what is more, the Gospel came to life in the Church, in the Holy Eucharist. In the Christ of the Holy Eucharist Christians learned to know the Christ of the Gospels, and so His image became vivid to them.”
Fr. George Florovsky, Bible, Church, Tradition: An Eastern Orthodox View, pp. 48-49