one’s own rarely turn out to be completely erroneous

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Senior Member
Official Guide to the GRE

What readers most commonly remember about John Stuart Mill’s classic exploration of the liberty of thought and discussion concerns the danger of complacency: in the absence of challenge, one’s opinions, even when they arecorrect, grow weak and flabby. Yet Mill had another reason for encouraging the liberty of thought and discussion: the danger of partiality and incompleteness. Since one’s opinions, even under the best circumstances, tend to embrace only a portion of the truth, and because opinions opposed to one’s own rarely turn out to be completely erroneous, it is crucial to supplement one’s opinions with alternative points of view.

Could someone please explain the bold part?​
  • Florentia52

    Modwoman in the attic
    English - United States
    "Opinions opposed to one's own rarely turn out to be completely erroneous" = Opinions that are the opposite of yours are usually partly correct.


    Senior Member
    English UK
    Can you tell us what your difficulty is, DUET?

    There are three elements here:
    (1) "Opinions opposed to one's own"
    (2) "rarely turn out to be"
    (3) "completely erroneous".

    Which is the part that you're asking about?
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