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His great intelligence allowed him to accurately guess the thoughts of others and made him perhaps the preeminent architect of Sauron's defeat.
Gandalf - Wikipedia Gandalf - Wikipedia
He seemed the oldest and least in stature, but Círdan the Shipwright felt that he was the greatest on their first meeting in the Havens, and gave him Narya, the Ring of Fire. Gandalf was one of the wisest and most knowledgeable beings in Middle-earth, believed by Galadriel to be more worthy than Saruman in leading the White Council, though he was less mighty in magic, until his resurrection.For, my lords, it may well prove that we ourselves shall perish utterly in a black battle far from the living lands; so that even if Barad-dûr be thrown down, we shall not live to see a new age.
Gandalf the Grey How-to (with Pictures) - Instructables Gandalf the Grey How-to (with Pictures) - Instructables
Yet, as he was now the sole emissary of the Valar to Middle-earth, he was granted the power to "reveal" more of his inner Maiar strength. Gandalf was able to evade the four Nazgûl and successfully reach Rivendell and was welcomed by Glorfindel. When the attack was beginning, Gandalf halted them, to warn that the Orcs and Wargs were coming to claim the treasure. He then began his sojourn in Middle-earth and over many centuries, he walked among the Elves as a stranger, learning from them and teaching them.He later revealed himself as one of the Istari, and eventually became known as not only the wisest but also the most powerful of them. This would imply that Gandalf could use Shadow powers as well as Light powers, though this is unconfirmed and at any case highly unlikely. He was nominated for an Academy Award for his portrayal of Gandalf in The Lord of the Rings: The Fellowship of the Ring, making him the only individual cast member to be nominated for his performance. On their escape out, the Company was saved by the Eagles of the Misty Mountains; Gandalf once had healed the Lord of the Eagles from an arrow-wound, and thenceforth they became friends. Gandalf's carefully laid plans and words of wisdom, along with acts of heroism not seen since the elder days, had defeated Sauron's first move.