I was thinking about this today when i seen this in ROTK....
Quote:
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Gandalf it was that last spoke to Faramir ere he rode east. "do not throw your life away rashly or in bitterness, " he said. "you will be needed here, for other things than war. Your father loves you , Faramir , and will remember it ere the end. Farewell!
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I think this is an obvious foresight of gandalf, percieving that Faramir would be needed to convince Denethor of Aragorns claim, and to also help in the task of getting Denethor to step down willingly and in good graces of the king. I guess that Faramir is the real key to this situation.