When it comes to duplicate contents shared on your website their is always a consequences for that. Plagiarism isn't taken lightly by any AdSense company especially Google. Google has slammed a lot of users for such act, copying others contents and pasting it on their own blog or forum. Anyone who is engaged on that, wouldn't last long if he or she is earning from AdSense ads, AdSense networks doesn't encourage plagiarism. It is better to read through the body of the heading, understand the contents very well then go to your website and create a new post based on your level of understanding of the information gained from another author, without copying word to word of everything written by the original author. At least in that way you aren't copying and pasting and Google wouldn't slam you, provided you provided the information based on your own words descriptions. Google and any other AdSense networks encourages hard work, and doesn't like where some publishers steals another user's hard work that he or she laboured to generate. It takes real hard work to generate a SEO related contents, seeing your hard work being used by another is very much annoying no doubt.