Gandalf, Moria, and Arrest

[Belegorn]

I'd like to know where Aragorn forecasted Gandalf's "imminent doom". I know Aragorn mentioned his misgivings to Gandalf about going into Moria, but where is the passage of Aragorn saying, "If you go into Moria Gandalf, you will die."

Originally Posted by FotR; A Journey in the Dark

I will follow your lead now - if this last warning does not move you. It is not of the Ring, nor of us others that I am thinking now, but of you, Gandalf. And I say to you: if you pass the doors of Moria, beware!

Foresight is of two kinds according to Tolkien. The one involves pre-vision, such as the gods who were allowed to see parts of the future by Eru. Then there is forecasting about a future not seen, "the deduction of the wise" by which "any mind, whether of the Valar or the Incarnate, may deduce by reason what will or may come to pass" [Osanwe-kenta, note 6].

I do not think Saruman's staff breaking was symbolic of his powers being lost. When Gandalf's staff broke he was still using his powers to fight the Balrog.