[armydoc]

In traditional Catholic theology, the term material heresy refers to an opinion that is objectively contradictory to the teachings of the Church, and as such heretical, but which is uttered by a person without the subjective knowledge of its being so. A person who holds a material heresy may therefore not be a "heretic" in the strict sense. Material heresy is distinguished from "formal heresy", i.e. a heretic opinion proposed deliberately by a person who is aware of its being against the doctrine of the Church.

http://en.m.wikipedia.org/wiki/Material_heresy

Appears to support my statement.

[ebb tide]

Wiki doesn’t doesn’t support anything. And your statement implied one material heretic can make an entire magisterium heretical. Silly nonsense.

You paint with quite a broad brush.

[piusv]

I don’t remember where I read it but I believe traditional Catholic theologians explain that Catholics can not be material heretics because they are supposed to know the Faith.