The Stoics aside, most of these Twitter nominations are terrible. What comes to mind immediately for me is:
Tocqueville’s Democracy in America
Jonathan Swift, Gulliver’s Travels or Melville’s Moby Dick
That’s off the top of my head, I am sure I am forgetting some strong candidates. Plato is too Straussian (not that there’s anything wrong with that…), Aristotle is too dull and it is often just lecture notes anyway, many other writers are too prolix, and contemporary books typically don’t have enough breadth, or for that matter wisdom, to top this list.
What is your pick?