Rule Book

 “Do unto others as thou 
would have them unto you do"...? And how!

 This most golden of rules 
we are told by our schools -- 
by our families as well...then and now. 
 
The second-most-golden of rules...?
“Cast thee not before porkers thy jew’ls!” 
There's a parallel line: 
“Hurl not pearls before swine!” 
(Dudes who overlook either be fools.)* 

* Some mss show the line, "Dudes who

one or two don't do be fools" here, but

all are of a late date.