Carlos —

I don't think the material sufficiency of Scripture IS explicitly taught by the Magisterium. Certainly it isn't found in Dei Verbum. I think the best you can do is to say that the Church's teaching is compatible with the position. Many of the Fathers taught what amounts to the material sufficiency of Scripture, and many theological heavyweights have espoused it as the best understanding of the relationship between Scripture and Tradition.

I think it is a mistake for Catholic apologists to go beyond that by saying that the Church teaches the material sufficiency of Scripture, when in fact the Magisterium of the Church has not taught it, at least not formally (no pun intended).

I say all of this notwithstanding the fact that I find Geiselman and Congar and others very persuasive on the point of the material sufficiency of Scripture (which is why I plug Tradition and Traditions on the back of the the documents of Vatican II.

It's just that this is a theological interpretation of the Tradition, not a magisterial expression of it. Those who dispute the point must reckon with Ratzinger, [now Pope [Emeritus] Benedict XVI], who has his own problems with the One Source theory.

Mark Brumley