He fears to be tempted by the ring. He knows that he will 'try to use the powers for good.' but using it, it would wield a power too great for him to contain. Something along those lines. I know how you feel though, my dad's friend asks me LotR questions non-stop. Maybe someone else could answer your second question better, but I think it is something like that.
Hope I helped a little
Aylwen
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...Come down now, they'll say. But everything looks perfect from far away - Come down now! But we'll stay.
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