There is a common phenomenon where people claim proverbial quotes were originally longer. One I often hear is “Jack of all trades master of none” originally including the follow up “often better than a master of none.”

If you research this, as well as the customer as always right as you claim, you will find no evidence of their longer ‘original’ forms [1].

[1] https://www.snopes.com/articles/468815/customer-is-always-ri...