The end paragraph of 'Instructions for American Servicemen in Britain 1942'
"You will soon find yourself among a kindly, quiet, hard-working people who have been living under a strain such as few people in the world have ever know. In your dealings with them, let this be your slogan: It is always impolite to criticize your hosts; it is militarily stupid to criticize your allies."
An excellent little book I found today. And much applies today as in 1942. More extracts to follow!