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There is nothing novel in scientism. The Victorian prophet of social evolution, Herbert Spencer, believed that the universe, life and society were moving from undifferentiated simplicity to a higher state of complex order. In politics, this meant a movement towards laissez-faire capitalism. In social contexts, “survival of the fittest” – an expression Spencer invented after reading Darwin’s On the Origin of Species – meant that anyone unable to stay afloat in such a society would struggle, sink and then disappear. Spencer welcomed this process, since for him it was evolution in action – the movement from lower to higher forms of life.

Many early-20th-century Enlightenment thinkers supported eugenic policies because they believed “improving the quality of the population” – weeding out human beings they deemed unproductive or undesirable – would accelerate the course of human evolution. When Pinker touches on eugenics in a couple of paragraphs towards the end of the book, he blames it on socialism: “The most decisive repudiation of eugenics invokes classical liberal and libertarian principles: government is not an omnipotent ruler over human existence but an institution with circumscribed powers, and perfecting the genetic make-up of the human species is not among them.” But a theory of entropy provides no reason for limiting the powers of government any more than for helping the weak. Science cannot underwrite any political project, classical liberal or otherwise, because science cannot dictate human values.

Exponents of scientism in the past have used it to promote Fabian socialism, Marxism-Leninism, Nazism and more interventionist varieties of liberalism. In doing so, they were invoking the authority of science to legitimise the values of their time and place. Deploying his cod-scientific formula to bolster market liberalism, Pinker does the same. Scientism is one of the Enlightenment’s bad ideas. But bad ideas do not evolve into better ones. They keep on recurring, often in cruder and sillier forms than in the past. Pinker’s formula for human progress is a contemporary example.

Like the faithful who tell you Christianity is “a religion of love” that had nothing to do with the Inquisition, Pinker stipulates that the Enlightenment, by definition, is intrinsically liberal. Modern tyrannies must therefore be products of counter-Enlightenment ideologies – Romanticism, nationalism and the like. Enabling liberals to avoid asking difficult questions about why their values are in retreat, this is a popular view. Assessed in terms of historical evidence, it is also a myth.

the 19th-century French positivist Auguste Comte – not discussed by Pinker – promoted a brand of scientism that was overtly anti-liberal. Human progress meant following the path of reason and moving from magical thinking to scientific inquiry. In a society based on science there will be no need for liberal values, since moral and political questions will be answered by experts

Comte’s core ideas – reason, science, progress and humanism – are precisely those that Pinker lists at the start of this book as the central values of the Enlightenment. Interestingly, neither of them mentions freedom or toleration.

Instead of acknowledging that the Enlightenment itself has often been illiberal, Pinker presents a Manichean vision in which “Enlightenment liberal values” are besieged on every side by dark forces.

The message of Pinker’s book is that the Enlightenment produced all of the progress of the modern era and none of its crimes.

Enlightenment Now is a rationalist sermon delivered to a congregation of wavering souls. To think of the book as any kind of scholarly exercise is a category mistake. Much of its more than 500 pages consists of figures aiming to show the progress that has been made under the aegis of Enlightenment ideals. Of course, these figures settle nothing. Like Pinker’s celebrated assertion that the world is becoming ever more peaceful – the statistical basis of which has been demolished by Nassim Nicholas Taleb – everything depends on what is included in them and how they are interpreted.

If an Enlightenment project survives, what reason is there for thinking it will be embodied in liberal democracy? What if the Enlightenment’s future is not in the liberal West, now almost ungovernable as a result of the culture wars in which it is mired, but Xi Jinping’s China, where an altogether tougher breed of rationalist is in charge? It is a prospect that Voltaire, Jeremy Bentham and other exponents of enlightened despotism would have heartily welcomed.

even if Pinker was capable of providing it, intellectual inquiry is not what his anxious flock demands. Only an anodyne, mythical Enlightenment can give them what they crave, which is relief from painful doubt

Judged as a therapeutic manual for rattled rationalists, Enlightenment Now is a highly topical and much-needed book. In the end, after all, reason is only the slave of the passions.

The Arabs introduced new crops and irrigation techniques, turning the island into a major producer of pistachios, citrus, sugarcane, and cotton. These cash crops were exported to all the major ports of the Mediterranean.

Pirates were expelled from their nest in southern France. Genoa, recovering from complete destruction by Arab pirates in 934, and Pisa, which also suffered devastating raids, began undertaking retaliatory expeditions. They started by clearing out bases on Corsica and Sardinia, and eventually went on to raid Ifriqiya itself.

as with the Spanish Reconquista and the Crusades, the reconquest of Sicily was spearheaded by warriors from northern Europe

Muslims, Jews, and Byzantine Christians were all allowed a dignity and freedom of worship unheard of elsewhere in either Christian or Islamic lands. Indeed, they were treated with more than just haughty indifference; men of merit were held in high esteem, whatever their religion. Talented Greeks and Arabs were given high positions as administrators, and craftsmen of all faiths were employed by the court.

A large army was sent from the empire’s eastern provinces to Italy, where the commanders set about raising auxiliaries. The Normans were always eager for battle and loot, and so a corps of several hundred knights joined the army. Among its leaders was one William de Hauteville, accompanied by two of his younger brothers. The force crossed the Straits of Messina, and met with initial success. But after two years, the expedition fell apart from factional squabbles. First, the Normans abandoned the enterprise. They punched far above their weight and were crucial to several victories, but felt they received an inferior share of the spoils. Then a conflict between the Byzantine general and admiral caused the former to be recalled to Constantinople, dooming any chance of victory.

From the papacy’s perspective, the conquest of Muslim Sicily would serve several purposes. First and foremost, it would eliminate a dangerous enemy of Rome. Sicily was the nearest base for the Muslim sea-raiders that had long plagued Christian lands in the western Mediterranean. Arab corsairs had sacked St. Peter’s in 846, and even occupied part of Apulia for several decades. Second, it expanded the influence of Rome within Christendom itself. A long-brewing conflict between eastern and western divisions of the Church was reaching a head around this time. The Greek Patriarch in Constantinople resented papal claims to primacy over all Christendom, and had theological quibbles of his own with the Latin rite. By investing Robert Guiscard as duke of Sicily, the pope was asserting his power in what had long been Constaninople’s purview.

The year was 1038, and the Byzantine Empire was at its height. Over the past century it had systematically broken the strength of several powerful enemies, and expanded their borders by hundreds of miles to recover lost territory. The treasury was full, the frontiers were secure, and the army was strong.

The new kingdom was the richest and most advanced state of western Europe. In part, this was because it took full advantage of the talents of its Muslim population, which skilled tradesmen, merchants, and scholars. Whatever the pope’s religious motives behind granting the Normans the right to conquer Muslim Sicily, they cared most of all about power. As such, they happily patronized Arabs, Greeks, and Jews alike.

Up until the Norman conquest, the Byzantines had been de facto protectors of all Christians in Sicily. They were the last Christian power to rule the island, and had maintained close contacts with the its Christian population throughout the Muslim occupation, launching several expeditions to liberate their coreligionists. The success of the Normans put an end to this, and allowed the Church of Rome to assume authority over Greek Christians in southern Italy. With Latin Christendom directly abutting Muslim Sicily, the papacy took a new concern for Christians living under Islamic rule. The new holy struggle envisaged not just taking back land from Muslims, but winning over the faithful from the Byzantine rite. This dynamic would play out during the Crusades, as western Europeans conquered once-Byzantine lands from the Muslims.

Norman governance concerned itself with taxation, military affairs, and justice, but various peoples were free to maintain separate customs and govern themselves at the communal level.

an astonishing amalgamation of wildly different styles: architects ornamented northern Gothic buildings with Arab designs, while Greek artists decorated the interiors with Byzantine mosaics. Nor was this fusion a strictly monumental phenomenon: the Tabula Rogeriana, a world atlas composed by an Arab geographer for Roger II, was produced as a bilingual Arabic-Latin text. The Sicilian court attracted scholars from as far afield as England and Baghdad, who then brought bits of its unique culture back to their homelands. This cultural exchange was much more than an accident of circumstance—the Norman kings took an active interest in the culture of the island, and several learned Arabic, Greek, and Sicilian. As late as 1250, the king of Sicily was fluent in all three languages.

One side-effect of the Norman reconquista was the gradual disappearance of Greek culture on the island. Southern Italy and Sicily had long maintained a Greek character, as far back as the first Euboean colonies of the 8th century BC. This had persisted under Roman rule, and was revitalized by later Byzantine reconquests.

the Normans expelled the last Byzantine garrison from Apulia in 1071, the same year as the siege of Palermo, and never again would a Greek power rule any part of Italy.

Over time, the Roman Church replaced Greek clergymen with Latins, and the Sicilian-speaking majority asserted its cultural power.

When the First Crusade was preached in 1095, the duke of Normandy and many other nobles took the cross, inspired by their cousins’ example. Within forty years of the Normans gaining a toehold in Muslim Sicily, Toledo and Jerusalem were back in Christian hands. Christian princes on both sides of the Mediterranean were aggressively expanding their domains, and everywhere Islam was in retreat. The Sicilian Reconquista was a precursor to these titanic clashes—itself not a holy war, but the opening act to the great crusading era.