To understand Nabokov in his published lectures on Proust, delivered to students he taught at Cornell University from 1948 to 1958, I had to better understand metaphor which provided a detour from my readings of The Search for Lost Time that took me through some of Shakespeare's figures of speech and 19th century studies of them. I would venture that more has been written about Shakespeare than any other English author; but current thinking on metaphor, and even on Shakespeare, lacks, as judged by what Amazon.com offers in print. Many important views of Elizabethan rhetoric are in books whose copyrights have long expired and now reside in the public domain.
History is forgotten as there is not much profit in it; you find yourself, before a monitor, in the archives of Project Gutenberg, which specializes in the past, spending nothing but time.
Note: If I can find Macbeth, read rather than dramatised, on Audible.com I will buy it, and Hamlet too. Let me experience the emotion from Shakespeare's words first-hand and not have it performed or translated for me by actors of different understandings.
Oh, and by the way, I still have sheep; they finance my literary avocations for which I am grateful.