It’s not a bad thing to use block quotations. This is what SO and SO says about it:

…if you are using  a quotation longer than four lines of text (or more than 40 words), follow the format for a block quotation. However, please e aware that in shorter essays, a block quotation is probably too long to include.  You should consider paraphrasing or summarizing some of it, and only quoting the words and phrases that are necessary to your argument in their original form. “Writing Genres,” 152

I think this is spot on, but we might reconsider the amount of text necessary for a block quotation in a blog space.

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