Famous Quote is a place to find quotations from famous people. You can browse by author or by topic, and there’s a search box if you’re looking for a specific name or key word. It’s a simple, easy-to-use site with no spectacular graphics and just one annoying ad space, but it’s one good place to go for inspiring quotes.
Most days, there are posts introducing an author or a theme. And there is a random quote generator on the right side of the page at the bottom (scroll to the bottom of the page on the mobile site).
You can follow their Twitter feed here.
One thing you can do is to start a Weekly Quote page in your language portfolio, like I’ve done on your class site. You can use this at the beginning of class, during portfolio sharing time, if you run out of things to talk about.