“Every man is born an Aristotelian or a Platonist. I do not think it possible that anyone born an Aristotelian can become a Platonist; and I am sure that no born Platonist can ever change into an Aristotelian. They are two classes of man, beside which it is next to impossible to conceive a third.” — Samuel Taylor Coleridge

“The human species, according to the best theory I can form of it, is composed of two distinct races, the men who borrow, and the men who lend.” — Charles Lamb

“All literary critics are either Iliad critics or Odyssey critics. That is, interest in literature tends to center either in the area of tragedy, realism, and irony, or in the area of comedy and romance.” — Northrop Frye

“There are 10 kinds of people in the world, those who understand binary and those who don’t.” — old geek joke

“There are two types of people in this world: those who like Neil Diamond, and those who don’t.” — Bob Wiley

“There are two kinds of people in the world, those who believe there are two kinds of people in the world and those who don’t.” — Robert Benchley

UPDATE via Josiah Neeley on Twitter: