These may be interesting observations or relationships, practical or ethical guidelines (also called rules of thumb), and even humorous parodies of physical laws.
Adages often originate in popular fiction, or in Internet forums such as Usenet. One literary personage renowned for his use of adages was Sancho Panza in Miguel de Cervantes' novel Don Quixote. Through overuse, an adage may become a cliché.
Famous adages from popular fiction:
Famous adages from Usenet:
Other famous adages: