• In Defense of Dehortatio: A Review of Mardy Grothe's Neverisms
• Exhortation
• Hortatory Discourse
• Imperative Mood
• Persuasion

Examples:

• "Never look a gift lion in the mouth."
  (Lemony Snicket, Horseradish: Bitter Truths You Can't Avoid. HarperCollins, 2007)

• "Never give all the heart . . .."
  (title and opening line of a poem by William Butler Yeats, 1904)
• "Never ever stop in the middle of a hoe-down."
  (Homer Simpson, "Homer the Vigilante." The Simpsons, 1994)
• "If you want more time in your life, don't watch TV."
  (attributed to Bob Keeshan in the role of Captain Kangaroo)
• "Death be not proud, though some have called thee
  Mighty and dreadful, for thou art not so . . .."
  (opening lines of one of John Donne's Holy Sonnets, 1609-1610)
• "Do not go gentle into that good night,
  Old age should burn and rave at close of day;
  Rage, rage against the dying of the light. . . ."
  (opening lines of a villanelle by Dylan Thomas, 1951)
• "Do not stand at my grave and weep.
  I am not there. I do not sleep. . . ."
  (opening lines of a poem by Mary Elizabeth Frye, 1932)
• "Don't look back. Something might be gaining on you."
  (Satchel Paige, pitcher elected to the Baseball Hall of Fame in 1971)
• Bill Bryson's Six Rules of Public Dining
  "I do have six rules of public dining to which I try to adhere. They are:

  1. Never eat in a restaurant that displays photographs of the food it serves. (But if you do, never believe the photographs).
  2. Never eat in a restaurant attached to a bowling alley.
  3. Never eat in a restaurant with flocked wallpaper.
  4. Never eat in a restaurant where you can hear what they are saying in the kitchen.
  5. Never eat in a restaurant that has live entertainers with any of the following words in their titles: Hank, Rhythm, Swinger, Trio, Combo, Hawaiian, Polka.
  6. Never eat in a restaurant that has bloodstains on the walls."

  (Bill Bryson, The Lost Continent. Harper & Row, 1989)

• "Never look down on anybody unless you're helping him up."
  (attributed to Jesse Jackson)
• "Never give in. Never give in. Never, never, never, never--in nothing, great or small, large or petty--never give in, except to convictions of honor and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy."
  (Winston Churchill, speech to the students of Harrow School, October 29, 1941)
• "As long as there is injustice, whenever a Targathian baby cries out, wherever a distress signal sounds among the stars, we'll be there. This fine ship, this fine crew. Never give up . . . and never surrender."
  (Tim Allen as Jason Nesmith in Galaxy Quest, 1999)
• "Never put anything on paper, my boy, and never trust a man with a small black moustache."
  (P.G. Wodehouse, Cocktail Time, 1958)
• "Don't tell me what to do. Don't you never never tell me what to do."
  (Beloved to Denver in Toni Morrison's novel Beloved, 1987)
• "Never recreate places from your memory."
  (Leonardo DiCaprio as Cobb in Inception, 2010)
• "Never answer an anonymous letter."
  (attributed to Yogi Berra)
• "Never play cards with a man called Doc. Never eat at a place called Mom's. Never sleep with anyone whose troubles are worse than your own."
  (Nelson Algren, in Newsweek, July 2, 1956)
• "The best advice one can offer to both press and public is the suggestion Ronald Reagan himself gave to students in Chicago: 'Don't let me get away with it. Check me out. Don't be the sucker generation.'"
  (James Nathan Miller)
• "Behind me, I heard a young woman of 25 say, 'If it weren't for my horse, I wouldn't have spent that year in college.' Do NOT think about that statement too long or blood will shoot out your nose."
  (Lewis Black)
• "Never let a fool kiss you--or a kiss fool you."
  (Joey Adams, quoted by Mardy Grothe in Never Let a Fool Kiss You or a Kiss Fool You. Viking, 1999)
• "At one early, glittering dinner party at Buckingham Palace, the trembling hand of a nervous waiter spilled a spoonful of decidedly hot soup down my neck. How could I manage to ease his mind and turn his embarrassed apologies into a smile, except to put on a pretended frown and say, without thinking: 'Never darken my Dior again!'"
  (Beatrice Lillie, Every Other Inch a Lady, 1973)