What is this quotation means," Opinions founded on prejudice are always sustained with the greatest of violenc

Question

last word is violence......

Answer 1

Often shown as a Hebrew proverb, the text was (also) authored by Francis Jeffrey, Scottish critic and jurist (1773 - 1850).  

Prejudice may be defined in a number of ways; but generally it is used to mean a negative attitude toward an entire category of people such as a racial or ethnic minority; bias for or against someone or something that fails to take true account of their characteristics; a judgment or opinion formed before the facts are known.

In most cases, these judgments, attitudes and opinions are founded on suspicion, intolerance, and the irrational hatred of other races, religions, creeds, or nationalities.

**Thus, I believe that the quotation is intended as an observation that the weakness of an opinion founded on prejudice, if it is to be sustained, is sustained not by reason or argument, but rather by "the greatest violence."