synonyms/phrases/poems related to: 情深恭敬少
The so call " poem" itself is not very polished. I suppose the person who wrote "情深恭敬少 " was thinking an idea along the line of " 熟不拘禮 " ( being so close, there's no need for formalities" )

For 知己談笑多 which is not a convincing statement because 酒肉朋友 談笑 more. Anyway, a phrase "酒逢知己千杯少" (It is such a joy to drink with good friends, one can forget how much he has drunken.) is from a famous poem that depict heartfelt interaction between good friends.