Aziraphale frowned a bit as he considered Dawn's question.

"I suppose it's possible to find a way to block such a gift, and of course I imagine it could be taken away by the source of the prophecies themselves, but I don't know if you could simply remove it. Imagine it as any other sort of talent -- you can't take away a person's knack for music or mathematics, and think this would into the same sort of category. On the other hand, I don't know very much about magic personally. So I won't say for certain that there isn't some way to produce a...sort of curse, if you will, that would take away one's gift of prophecy."