A usually pithy and familiar statement expressing an observation or principle generally accepted as wise or true
As the famous adage goes "The show must go on," and it did.
Is the adage "The camera never lies" true?
You know the old adage "A picture is worth a thousand words."
This goes to prove the old adage: "You get what you pay for."
There is a common adage in science that the more you study a phenomenon, the more confusing it becomes.