Given the above, one is tempted to conclude the irrelevance of Teresa's writings, but this would be too simplistic. Her visions may be valuable guides to belief even if they are not divinely inspired. I think so. The difficulty is finding the right way to characterise what's at stake. Let's describe the dichotomy which presents Teresa's challenge to the hierarchy as Autonomy vs. Authority.
Reason is appealed to by both sides in an attempt to show that their bases of argument are reliable.
This, of course, doesn't guarantee that each side can be successful in its appeal to reason - that's an issue for detailed argument. Teresa's importance is as an expression of the fact that an individual's grounds for belief can be just as reasonable as those enshrined in the received views of the established community. The place of intuition in belief-formation is harder to understand, but the writings of Teresa can give us some insight, and this is part of their value. She concludes that he is in mortal sin. Note the impertinence of this conclusion, when set beside, for example, the views of Augustine on our inability to know the inner secrets of another.