It is quite false to limit the “sources of teaching” to Scripture and tradition, and to separate tradition from Scripture as only an oral testimony or teaching of the Apostles. In the first place, both Scripture and tradition were given only within the Church. Only in the Church have they been received in the fulness of their sacred value and meaning. In them is contained the truth of Divine Revelation, a truth which lives in the Church. This experience of the Church has not been exhausted either in Scripture or in tradition; it is only reflected in them. Therefore, only within the Church does Scripture live and become vivified, only within the Church is it revealed as a whole and not broken up into separate texts, commandments, and aphorisms. This means that Scripture has been given in tradition, but not in the sense that it can be understood only according to the dictates of tradition, or that it is the written record of historical tradition or oral teaching. Scripture needs to be explained. It is revealed in theology. This is possible only through the medium of the living experience of the Church.
We cannot assert that Scripture is self-sufficient; and this 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. We can say that Scripture is a God-inspired scheme or image (eikón) of truth, but not truth itself. Strange to say, we often limit the freedom of the Church as a whole, for the sake of furthering the freedom of individual Christians. In the name of individual freedom the Catholic, ecumenical freedom of the Church is denied and limited. The liberty of the Church is shackled by an abstract biblical standard for the sake of setting free individual consciousness from the spiritual demands enforced by the experience of the Church. This is a denial of catholicity, a destruction of catholic consciousness; this is the sin of the Reformation. Dean Inge neatly says of the Reformers: “their creed has been described as a return to the Gospel in the spirit of the Koran” (Very Rev. W. R. Igne, The Platonic Tradition in English Religious Thought, 1926, p. 27). 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, crystallizing 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 Eucharist Christians learned to know the Christ of the Gospels, and so His image became vivid to them.
This does not mean that we oppose Scripture to experience. On the contrary, it means that we unite them in the same manner in which they were united from the beginning. We must not think that all we have said denies history. On the contrary, history is recognized in all its sacred realism. As contrasted with outward historical testimony, we put forward no subjective religious experience, no solitary mystical consciousness, not the experience of separate believers, but the integral, living experience of the Catholic Church, catholic experience, and Church life. And this experience includes also historical memory; it is full of history. But this memory is not only a reminiscence and a remembrance of some bygone events. Rather it is a vision of what is, and of what has been, accomplished, a vision of the mystical conquest of time, of the catholicity of the whole of time. The Church knows naught of forgetfulness. The grace-giving experience of the Church becomes integral in its catholic fulness.
This experience has not been exhausted either in Scripture, or in oral tradition, or in definitions. It cannot, it must not be, exhausted. (The Catholicity of the Church)