@Emil,
Emil;145589 wrote:Regarding the marked sentence. I doubt that, but first tell me what you meant exactly. Did you mean that in all cases where the author is wrong about the matter, it is bad if he is a good writer? Think of Darwin. The aforementioned sentence implies that it is a vice that Darwin was a good writer about the things he got wrong. Do you agree with that? If you want specifics I would have to look it up. Otherwise you may think of Newton instead whose theory of physics is wrong but very useful.
You did not mark a sentence, but from the context, it seems that you meant to mark:
[INDENT][INDENT]When one is wrong, being a "good writer" is a vice, not a virtue, because it leads more people astray.[/INDENT][/INDENT]
I think that insofar as one is wrong, it is bad to be eloquent and persuasive. Of course, there may be something wrong in a work that has much that is right about it, and then it is good to be eloquent and persuasive about what is right.
In the particular example at issue ("The Will to Believe"), there is so little that is right about it that we can say that it simply would have been better if James had been less eloquent and persuasive in it. But in the examples of Newton and Darwin that you have in mind, there is something fundamentally right about what they were doing that makes their eloquence and persuasiveness overall a good thing, even though they were wrong in some aspects.
In other words, insofar as someone is right, it is good if one is eloquent and persuasive, and insofar as someone is wrong, it is bad if one is eloquent and persuasive. If judging a work as a whole, then it will depend upon the amount and type of correctness and incorrectness, whether it is better or worse, overall, for the work to be eloquent and persuasive.