You can do anything if you don't have a vulgar mind.
Chaplin told Martha Raye during the shooting of Monsieur Verdoux, “You can do anything if you don’t have a vulgar mind. Have a little pixyishness. Let them have fun, it won’t be vulgar. Some can swear, others can’t. It’s like another gift, a talent. It’s there or it isn’t. You have to be what you are naturally.” (Quoted in Charles Chaplin Jr.’s “My Father, Charlie Chaplin”