Bingowings said:

If Anakin is hearing voices perhaps in episode 2 when he is kneeling at his mother's grave he could hear her repeat.

"Son, my place is here, my future is here. It is time for you to let go..."

Almost like it's whispered on the wind.

It would add to the idea I suggested earlier that Anakin was driven insane by the death of his mother and that Vader is an alternate personality that grows in strength in the background of the later half of Episode 2 and the whole of Episode 3 and only begins to fade by the end of Episode 5.

I like the quote idea. But having Anakin and Vader be two personalities is not a concept I've personally liked.