Update: It looks like this capability was removed when Google replaced the Research tool with the Explore tool.

Have you ever been working on a document and wished that you could find a great quote from an authoritative figure to add to it? Normally, this sends people over to their nearest internet browser to search for a quote, but there’s a way to find great quotes right within Google Docs itself.

1. In Google Docs, go to Tools > Research. 
2. In the search menu, select Quotes from the dropdown menu. Search for a quote, either by the author or a keyword.
3. To insert the quote into your document, put your mouse over the quote and click Insert. 

Click here to watch this video on YouTube.