I absolutely love sayings. One of the most universal ones is “when pigs fly”. Another is “look before you leap”. Also “there is no such thing as a free lunch”.
Maybe “saying” that isn’t the best term for them. Are they adages?
Lets see. Per Mirriam Webster an adage is:
a saying often in metaphorical form that embodies a common observation
And a saying is:
something said ; especially : adage