His long struggle with physical passion was almost over, and, as with many other great sensualists, its place had been taken by an obsession with dea… - Kenneth Clark

Like most able men who have had to educate themselves the hard way, Charlemagne felt strongly the value of education, and in particular he saw the importance of an educated laity.

This became Delacroix's theme: that the achievements of the spirit — all that a great library contained — were the result of a state of society so delicately balanced that at the least touch they would be crushed beneath an avalanche of pent-up animal forces.

What happened? It took Gibbon six volumes to describe the decline and fall of the Roman Empire, so I shan’t embark on that. But thinking about this almost incredible episode does tell one something about the nature of civilisation. It shows that however complex and solid it seems, it is actually quite fragile. It can be destroyed. What are its enemies? Well, first of all fear – fear of war, fear of invasion, fear of plague and famine, that make it simply not worthwhile constructing things, or planting trees or even planning next year’s crops. And fear of the supernatural, which means that you daren’t question anything or change anything. The late antique world was full of meaningless rituals, mystery religions, that destroyed self-confidence. And then exhaustion, the feeling of hopelessness which can overtake people even with a high degree of material prosperity. There is a poem by the modern Greek poet, Cavafy, in which he imagines the people of an antique town like Alexandria waiting every day for the barbarians to come and sack the city. Finally the barbarians move off somewhere else and the city is saved; but the people are disappointed – it would have been better than nothing. Of course, civilisation requires a modicum of material prosperity – enough to provide a little leisure. But, far more, it requires confidence – confidence in the society in which one lives, belief in its philosophy, belief in its laws, and confidence in one’s own mental powers. The way in which the stones of the Pont du Gard are laid is not only a triumph of technical skill, but shows a vigorous belief in law and discipline. Vigour, energy, vitality: all the great civilisations – or civilising epochs – have had a weight of energy behind them. People sometimes think that civilisation consists in fine sensibilities and good conversation and all that. These can be among the agreeable results of civilisation, but they are not what make a civilisation, and a society can have these amenities an