Some quotations lodge in memory because of their content. Others stick because of their shape. Chiasmus — a rhetorical figure in which words or ideas are repeated in reverse order — is one of the most reliable tools for creating a phrase that feels both elegant and inevitable.
What Is Chiasmus?
The word comes from the Greek letter chi (χ), which looks like an X — an apt symbol for a device that crosses two parallel phrases. In a chiasmus, the second half mirrors the first, but with the key terms reversed:
- A B / B A
This creates a sense of balance that also moves — the sentence turns back on itself and arrives somewhere different from where it began.
Famous Examples
John F. Kennedy’s inaugural address (January 20, 1961) contains perhaps the most quoted chiasmus in American political history: “Ask not what your country can do for you — ask what you can do for your country.” Kennedy’s speechwriter Ted Sorensen crafted the line, though Kennedy himself had used similar constructions in earlier speeches. The reversal makes the command feel complete; it is hard to argue against something that has already answered itself.
Winston Churchill deployed the device with characteristic bluntness: “We shape our buildings; thereafter they shape us.” The symmetry gives the observation a quality of inevitability that a simple statement — “buildings affect the people who use them” — would entirely lack.
Oscar Wilde, perhaps history’s most consistent employer of the chiasmus for comic effect, wrote: “To lose one parent, Mr. Worthing, may be regarded as a misfortune; to lose both looks like carelessness.” He used the device constantly, as in: “I can resist everything except temptation” — not a strict chiasmus but employing the same reversal logic.
Ancient Roots
The device appears throughout the Hebrew Bible, where it structures entire passages: the book of Leviticus uses nested chiastic patterns across multiple chapters, with themes introduced early mirrored in reverse as the passage concludes. Classical Greek and Latin rhetoric formalized the figure. Cicero used it extensively in his legal and political speeches.
Why It Works
Cognitive psychologists note that the brain finds parallel structures easier to process and remember. The chiasmus provides that parallelism but introduces a surprise — the reversal — that rewards attention. The result is a phrase that feels simultaneously familiar and fresh. When a speaker lands a clean chiasmus, audiences often applaud spontaneously, responding to the shape of the thought before they have fully processed its content.
For anyone studying what makes quotations endure, chiasmus is worth understanding: it is one of the oldest and most reliable answers to that question.