Will sharing popular articles badly impact google rankings?

I read in a book that Panda and Penguin take into account unique content, therefore if an article you publish does not pass Copyscape or similar, your website will be penalised for having such articles.
I am wondering what happens if I share popular articles in my website, or I quote large parts of third parties' articles just to comment on them... will my website be penalised?

thanks!

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