Martin is a character in the philosophical novel Candide by Voltaire. He follows Candide through many of the main character's adventures, providing one of the novel's few voices for common sense. Note: For the operetta based on the book, please see Candide (operetta). ... The tone of this article is inappropriate for an encyclopedia. ... Note: For the operetta based on the book, please see Candide (operetta). ... The term common sense (or as an adjective, commonsense) describes beliefs or propositions that seem, to most people, to be prudent and of sound judgment, without dependence upon esoteric knowledge. ...