Customs of Your TribeRead it all here.
In 'Caesar and Cleopatra' George Bernard Shaw wrote: Pardon him ... he is a barbarian, and thinks that the customs of his tribe and island are the laws of nature.
It is ironic that Caesar was speaking about Britannus (a British Celt). We say ironic because:
A) In modern times the British are considered so civilized.
B) It is civilized, educated people who most often make the mistake of assuming their customs are the laws of nature.
What many people do not realize is that "When in Rome, do as the Romans" works both ways. It is as difficult to shift gears 'downward' as it is upwards -- perhaps more so. Yet you can get in a lot of trouble if you can't do this.