Quoting is a very common practice among academics. You copy a piece of someone else's work and attribute the proper credit. But the problem is doing it online, since it could be perceived as duplicate content which is bad for SEO. After searching for a while I've found some claims that Google is very secretive about its methods. Does anyone know how I can safely have quotes in my website and let Google know it's a quote?
Content is made up of two things -- the literal text and the context. Since the context is different, it's not duplicate content. Provided you are properly citing a third party, there will be no problem. If your content is of value, then you do not need to worry.
You can markup a quote in a way similar to the following: