False. Even if a proverb is well-known, it is still important to properly attribute it to its source if you are using it in a formal or academic context. Failure to do so could be considered plagiarism, as it may give the impression that you came up with the idea yourself when in fact it is the work of someone else. Additionally, citing sources adds credibility to your writing and helps to avoid any potential misunderstandings or disputes about the origins of a particular saying or proverb.