- How sure this is
- 33% sureLots of sources credit Aristotle with this, and they agree with each other. The book or the speech it first came from hasn't turned up yet.
- What turned up
- Does not appear anywhere on Wikiquote's Aristotle page. Commonly and inconsistently attributed across Aristotle, Plato, and Laozi, and often conflated with the Delphic/Socratic maxim "Know thyself."