In his speech to this year’s World Economic Forum at Davos, Canadian prime minister Mark Carney mourned the demise of international cooperation by evoking an authority from ancient Greece.

“It seems that every day we’re reminded that we live in an era of great power rivalry, that the rules-based order is fading, that the strong can do what they can, and the weak must suffer what they must. And this aphorism of Thucydides is presented as inevitable, as the natural logic of international relations reasserting itself.”

Journalists and academics from Denmark, Greece and the United States have quoted the same line from the ancient Greek historian when discussing Donald Trump’s demand for Greenland. It is cited as inspiration for his adviser Stephen Miller’s aggressive foreign policy approach, not least towards Venezuela.

In blogs and social media, the fate of Gaza and Russia’s invasion of Ukraine have been interpreted through the same frame. It’s clearly difficult to contemplate today’s world and not react as W.H. Auden did to the collapse of the old order in 1939: “Exiled Thucydides knew.”

The paradox of the “strong do what they can” line is that it’s understood in radically different ways. On the one hand, it’s presented as a description of the true nature of the world (against naive liberals) and as a normative statement (the weak should submit).

On the other hand, it’s seen as an image of the dark authoritarian past we hoped was behind us, and as a condemnation of unfettered power. All these interpretations claim the........

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