This is a quote from a Sherlock Holmes story. " I think that might help in understanding the quote. A delusion is a mistaken opinion, or more strongly, it is a belief held with strong conviction despite superior evidence to the contrary.
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kunsusukinot to wash linen of the sort in publicThis is a take on an idiom. "wash...of the sort" implies dirty. The actual idiom is to wash (or air) one's dirty laundry (or linen) in public. It means to talk to other people about personal things that you should keep private.