The blockquote tag in HTML can be a useful way to pull content out of your posts to highlight it for readers, but Google has said that text in a blockquote isn’t treated any differently than other text on your page.
You can read more about this from this post at Search Engine Journal.
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If you write a relatively long blog post, you likely include a few snippets of text in blockquotes to help break up the page a bit. It can be a great way to add some white space and make the content easier to consume.
A user recently asked Google if text in blockquotes was treated any differently than normal text. In short, it’s not. While blockquotes are often pieces of text pulled in from other sources, many times they’re pieces of text that have been repeated (or pulled from) the main article. Google can’t always know which it is, so they treat the text like any other text and process it normally.
That said, if your post consists mostly of blockquotes full of text from other sources, Google may consider that to be duplicate content. While there is no penalty for duplicate content, per se, your page may be devalued as a result of it.
Google will typically give more weight to the page where content was first posted, and will devalue pages that copy it. Ultimately, though, that has nothing to do specifically with blockquotes; duplicate content is duplicate content.
As Matt Southern at Search Engine Journal said, “using a blockquote is perfectly fine, as long as it’s done tactfully”.