Aphorism

Aphorism - This is a clever expression, usually made in “a matter of fact tone” (literary-devices.com) It is based on a truth and has some type of underlying message or piece of wisdom. It is sometimes philosophical and provides some great insight. Other times it is used in an insulting manner, such as a dad yelling at his son: “my house, my rules.”
Examples:
* If it ain't broke, don't fix it
* Either shape up or shape out
* Hope for the best but prepare for the worst