The Return of the King
"Good tidings!" cried Éomer. "Even in this gloom hope gleams again. Our Enemy's devices oft serve us in his despite. The accursed darkness itself has been a cloak to us. And now, lusting to destroy Gondor and throw it down stone from stone, his orcs have taken away my greatest fear. The out-wall could have been held long against us. Now we can sweep through—if once we win so far." (5.5.36)
Do I not know thee, Mithrandir? Thy hope is to rule in my stead, to stand behind every throne, north, south, or west. I have read thy mind and its policies. Do I not know that you have commanded this halfling here to keep silence? That you brought him hither to be a spy within my very chamber? And yet in our speech together I have learned the names and purpose of all thy companions. So! With the left hand thou wouldst use me for a little while as a shield against Mordor, and with the right bring up this Ranger of the North to supplant me. (5.7.36)
Concerning this thing [the Ring], my lords, you now all know enough for the understanding of our plight, and of Sauron's. If he regains it, your valour is in vain, and his victory will be swift and complete: so complete that none can foresee the end of it while this world lasts. If it is destroyed, then he will fall; […] And so a great evil of this world will be removed.
Other evils there are that may come; for Sauron is himself but a servant or emissary. Yet it is not our part to master all the tides of the world, but do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who life after may have clean earth to till. What weather they shall have is not ours to rule. (5.9.61-2)