I was told that (Serge) Lang has never fallen in love with categories, to use a polite euphemism. Other people claim that, in some occasion, he has even declared his lack of interest in the subject in a somewhat harsh tone. However, I couldn't find anything (explicit) in his work in favor of these claims. Is there any document (a letter, a paper, a book, ...) where one can clearly read about his point of view on category theory? Is there any anecdote or personal episode that you could eventually tell in respect to this?
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From p.105 of the first edition of Lang's Algebra, under the heading EXERCISES:
In response to amWhy's comment, I looked at the Revised 3rd edition of the book, where the section on Homological Algebra contains a much kinder but still recognizable version of the above:
According to this MO answer, the quote is unchanged between the first and second editions.