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How do we know you're not just as filthy and sent by them to nick the ring by being filthy when you have lulled us with your filthy eastern ways?
— John ‧ Help!

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker piles suspicion onto the listener by repeating the word filthy across an accusation of theft and deception. The reference to eastern ways adds prejudice to the distrust. The circular repetition makes hostility itself seem to supply the evidence for the accusation.
Context reviewed