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“Whereas it is one of the rules of intrinsic reading that you should read an author's preface and introduction before reading his book, the rule in the case of extrinsic reading is that you should not read a commentary by someone else until after you have read the book. This applies particularly to scholarly and critical introductions. They are properly used only if you do your best to read the book first, and then and only then apply to them for answers to questions that still puzzle you. If you read them first they are likely to distort your reading of the book.
[How to Read a Book (1972), P. 172]”
― Mortimer J. Adler and Charles Van Doren