Concerning PARSIFAL, was Wagner familiar with Dostevsky's THE IDIOT?

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https://www.talkclassical.com/47662-parsifal-5th-opera-ring-2.html

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Post by gggg gggg
https://www.talkclassical.com/47662-parsifal-5th-opera-ring-2.html

Was Wagner familiar with BORIS GODUNOV?:

According to this:

- ...The fool embodies Pushkin’s most important political statement, namely that the uneducated people accept everything if only the old is replaced, without realizing that the new will not be better than the old.

https://opera-inside.com/boris-godunov-by-modest-mussorgsky-the-opera-guide-and-synopsis/