You are a proper fool, I said.

from T.S. Eliot – The Waste Land on Rap Genius

Meaning

Besides being a withering put down, this line conjures up an earlier Eliot reference to ‘Hamlet’:
That begins,

No! I am not Prince Hamlet, nor was meant to be

and ends:
[I am]

At times, indeed, almost ridiculous—
Almost, at times, the fool

Note, too, that this passage ends with a quotation from Ophelia in the same play.

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