AronRa vs Ray Comfort (September 17th, 2012), Radio Paul's Radio Rants
“A drunkard is like a pig. The poor pig, however, is helpful. The drunk is worse and useless.”
Tripadis
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Sarvajna 26
Kannada poet, pragmatist and philosopherRelated quotes
“A pig is a pig," said the stranger, "and a pig-boy is a pig-boy.”
Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 1 (Ellidyr)
“A pig among people is a pig, he tells himself, but a pig among pigs is people.”
                                        
                                        Section 38 (p. 118) 
Venus Plus X (1960)
                                    
“I learned long ago never to wrestle with a pig. … You get dirty and besides the pig likes it.”
                                        
                                        Initially attributed to Cyrus S. Ching in Time, Vol. 56 (1950), p. 21. 
Misattributed 
Variant: Never wrestle with pigs. You both get dirty and the pig likes it.
                                    
“It’s so messy bleeding like a pig.”
A Murder is Announced (1950)