None that can hurt him?

[Lhunardawen]

I was preparing for my CbC post for "The White Rider" when I saw this...

...But we have One, the White Rider. He has passed through the fire and the abyss and they shall fear him.

This was said by Aragorn. I believe that with Gandalf's power came another that is completely opposite the Nazgul's. If their mere presence caused fear in the hearts of Men, so will Gandalf be feared by his enemies. This fear does not work for Aragorn and the rest, though...but his renewed (and greater) strength could have been enough to ward off their advances.