Like the word association game, except instead of posting the word that reminds you of the last, you post the saying or the quote that reminds you of the last.
For quotes, when you can cite them please do so. Of course, there are those that are unknown or obscure and its ok if you cant cite then. Common sayings like "Dont count your chickens before they hatch" dont need to be cited either.
To be or not to be - William Shakespeare