Evisse, your clue actually gives the answer - it is Gimli speaking. I did find the exact quote additionally, and can tell you to whom it was said - to Éomer. Gimli says:
Quote:
You speak evil of that which is fair beyond the reach of your thought, and only little wit can excuse you.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
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