Chapter 15, "Of the Noldor in Beleriand."

[Attalus]

Thanks, FM, for that insight. I had forgotten that last quote; it gave me goosebumps. Galadriel says to Frodo: "Gently are you avenged for my testing of your heart at our first meeting." That seems to be one of her powers, telepathy; one she apparently shared with Elrond, and, of course, Gandalf.

For they did not move or speak with mouth, looking from mind to mind; and only their shining eyes stirred and kindled as their thoughts went to and fro.

She also tells Frodo that she is not a counselor, echoing his earlier quip to Gildor, "Go not to the Elves for advice, for they will say both yes and no." Perhaps her wisdom could be imparted, too, to show others the future, or at least possible futures. She was a pupil of Aulë, and she devised the Mirror. Surely she would have had to have that gift to imbue the Mirror with that power. Or, perhaps the Mirror was merely a way to convey her gifts of Foreseeing without causing the fear that her speaking directly to the viewer's mind would have. She says, "Remember that the Mirror shows many things, and not all have yet come to pass. Some never come to be, unless those that behold the visions turn aside from their path to prevent them. The Mirror is dangerous as a guide of deeds."