When Albert Einstein and Henri Bergson rowed about time – The Economist

Apr 9th 2022

A CENTURY AGO, on April 6th 1922, the worlds most famous philosopher debated against the most famous physicist and lost. Henri Bergson, a French thinker who caused Broadways first traffic jam when he gave a lecture in New York, had challenged the notion of time advanced by Albert Einstein, the discoverer of relativity. Bergson was putting his thoughts into book form when Einstein came to Paris.

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At a gathering hosted by the Socit franaise de philosophie, which followed a talk by Einstein on relativity, they finally locked horns. Bergson summarised part of his forthcoming book, Duration and Simultaneity. Einsteins rebuttal was withering. There is no such thing as a philosophers time, he asserted. Bergsons version of it was merely psychological time. Their stilted non-conversation was a major anticlimax, says Elie During, a (living) French philosopher. Bergsons reputation waned; Time magazine named Einstein its person of the century.

Lopsided though the contest was, philosophers and scientists still ponder it. At stake is not just the momentous question of what time is. The debate was a key event in the separation of sciences and humanities into what C.P. Snow, a British novelist, later called two cultures. Einstein saw science as the ultimate arbiter of truth, says Jimena Canales, author of The Physicist and the Philosopher, a book about the episode. Bergson insisted that science did not have the last word. Their clash, Ms Canales says, raised the question, What is the relation between the subjective and the objective, and can we have a form of knowledge that includes both?

The philosopher was in the time business long before the physicist. Bergson published his first book, Time and Free Will, in 1889, when Einstein was ten years old. Initially an adherent of the idea that the world works like a machine, in the course of investigating evolution he encountered what he came to regard as sciences mistaken notion of time.

This views time in terms of space: an hour measures one-twenty-fourth of the Earths rotation. While useful, clock time misses what is most important about time, Bergson decided, namely duration. Rather than being disconnected from the past, the way one point on a ruler is separated from another, the present is suffused with it. Music is an example: each instant consists not only of itself but of what came before it. Pure duration is the form that the succession of our states of consciousness adopts when the self lets itself live, when it stops establishing a separation between its present and former states, Bergson wrote.

The passage of timethe present billowed with the pastprovides escape from a clockwork universe. This approach does not deny the importance of matter, but places life partially outside it. It is duration that permits novelty, both in the life forms that emerge from evolution and in the acts that proceed from the exercise of free will. Bergson applied his most famous epithet to lifes struggle with the material world, with which it is also bound up: lan vital. Peoples very identities are the temporal synthesis that is duration, as Mark Sinclair puts it in a recent book on Bergson.

His ideas were hugely influential. The literature of his day teems with Bergsonian characters, living between durational and clockwork worlds. T.S. Eliot (who heard him speak) seems to lament the splaying of time in space in The Love Song of J. Alfred Prufrock, writing of the evening spread out against the sky/Like a patient etherised upon a table. For the narrator of In Search of Lost Time, the memories awakened by a madeleines taste are enough to abolish clock time. Bergson married a cousin of Marcel Proust, the novels author, who was best man at his wedding. A spellbinding writer himself, Bergson won the Nobel prize in literature in 1927.

Even before his showdown with Einstein, though, Bergson was mocked for purveying metaphysical mumbo-jumbo. His exaltation of intuition, the faculty through which duration is apprehended, over intellect provided a fat target for Bertrand Russell, a British logician. According to Russell, writing in 1912, Bergson thought that the universe was a vast funicular railway, in which life is the train that goes up, and matter the train that goes down. Like advertising men Bergson relied upon picturesque and varied statement. In his History of Western Philosophy (1945), Russell added that the irrationalism of Bergsons philosophy harmonised easily with the movement which culminated in Vichya brutal comment about a Jew who refused special treatment from the Nazi-backed regime.

Einstein and Bergson were a study in contrasts. The German-born physicist was a pacifist and, until just before his death, a meat-eater; Bergson found philosophical grounds for Frances role in the first world warand was a vegetarian. Their clash in Paris was principally over Einsteins special theory of relativity, which had supplanted the unvarying time of Isaac Newtons physics.

Relativity states that time flows at different ratesfaster or slowerfor observers moving with respect to each other, as most do. Space compresses too, with the result that simultaneity is not absolute. This means that, in general, distinct observers witness events separated in space in different orders. Time and space blur together in a way implying that the past and future may be as real as the present, just as the Moon is as real as the Earth, a view sometimes called eternalism. The distinction between past, present and future is only a stubbornly persistent illusion, Einstein famously wrote.

This was a frontal challenge to Bergsons central idea. If time, he wrote, is thus spread out in spaceit takes account neither of what is essential to succession nor of duration in so far as it flows. Bergson did not deny Einsteins discoveries; philosophy must be constantly verified by contact with the positive sciences, he averred. But he maintained that relativitys profusion of times are not all equally real. It could not overthrow the common-sense belief in a single time, the same for all beings and all things. In fact, properly understood, relativity confirms that.

In defending this position, Bergson denied the consequence of the special theory illustrated by the twin paradox: if Peter remains on Earth while Paul rides a rocket into space and then returns, Peter will have aged more than Paul. Special relativity says that the faster something moves relative to you, the slower its clock will tick, from your point of view. Bergson insisted that the reunited twins will have aged by the same amount. This proved to be his Achilles heel, writes Ms Canales.

Most physicists continue to disdain Bergson, not mainly because of his twin gaffe but because of his attempted prison-break from the material world. Carlo Rovelli, an Italian theoretical physicist, makes one dismissive reference to the philosopher in his recent book The Order of Time. Bergson correctly pointed out that experiential time has more features than the time the physicists were talking about, Mr Rovelli says. But he incorrectly deduced from that there must be something that escapes physics in the real world. Now, when science is under attack from anti-vaxxers and others, Bergsons spiritualism seems to some not just wrong-headed but dangerous. Ms Canales says a physicist warned her that my career would be finished if she published a book that took Bergson seriously.

Yet he still matters, in two ways. He continues to influence thinkers who deem a materialistic account of the world to be inadequate, such as Rupert Sheldrake, author of The Science Delusion. And some who do not agree that science is deluded still find inspiration in Bergsons ideas, and seek to reconcile them with Einsteins.

Louis de Broglie, a pioneer of quantum physics, recognised Bergson as a seer. Had he studied quantum theory he would doubtless have observed with joy that in the image of the evolution of the physical world which it offers us, at each instant nature is described as if hesitating between a multiplicity of possibilities, de Broglie wrote. Jenann Ismael, a philosopher of science, argues that any being, man or machine, that gathers and uses information would perceive time as passing and the future as open. That time is no less real than Einsteins static four-dimensional spacetime, she says. There is a sense of conflict being replaced by a bridge.

The debate in Paris found both thinkers at their most dogmatic. Afterwards Bergson seems to have had second thoughts about some aspects of Duration and Simultaneitythough he never abandoned his basic position. In subsequent decades Einstein seemed to budge more. He acknowledged that metaphysics plays a role in science, and became more troubled by the failure of physics to give a complete description of time.

The problem of Now worried him seriously, wrote the philosopher Rudolf Carnap. It means something essentially different from the past and the future, yet this important difference does not and cannot occur within physics. Perhaps the ageing physicist came close to admitting that a philosophers time exists after all.

This article appeared in the Culture section of the print edition under the headline "Time v the machine"

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When Albert Einstein and Henri Bergson rowed about time - The Economist