what is the golden rule in chapter 13

I'm not sure if this is a golden rule, but the children are expected to remember the following....

Thus the dicta No Crawford Minds His Own Business, Every Third Merriweather Is Morbid, The Truth Is Not in the Delafields, All the Bufords Walk Like That, were simply guides to daily living: never take a check from a Delafield without a discreet call to the bank; Miss Maudie Atkinson’s shoulder stoops because she was a Buford; if Mrs. Grace Merriweather sips gin out of Lydia E. Pinkham bottles it’s nothing unusual—her mother did the same.

I dont think theres a ''Golden Rule'' in chapter 13. I dont think so