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There were experiences in previous centuries which might well have challenged this unqualified optimism. But the expansion of man's power over nature proceeded at such a pace that all doubts were quieted, allowing the nineteenth century to become the “century of hope” and to express the modern mood in its most extravagant terms. History, refusing to move by the calendar, actually permitted the nineteenth century to indulge its illusions into the twentieth. Then came the deluge. Since 1914 one tragic experience has followed another, as if history had been designed to refute the vain delusions of modern man.

 

Reinhold Niebuhr

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Though we neither can wish nor possess the power to go back to the reality of the nineteenth century, we have the opportunity to realize its ideals — and they were not mean. We have little right to feel in this respect superior to our grandfathers; and we should never forget that it is we, the twentieth century, and not they, who have made a mess of things. If they had not yet fully learned what was necessary to create the world they wanted, the experience we have since gained ought to have equipped us better for the task. If in the first attempt to create a world of free men we have failed, we must try again. The guiding principle that a policy of freedom for the individual is the only truly progressive policy remains as true today as it was in the nineteenth century.

 

Friedrich Hayek

 

For four hundred years the human race has not made a step but what has left its plain vestige behind. We enter now upon great centuries. The sixteenth century will be known as the age of painters, the seventeenth will be termed the age of writers, the eighteenth the age of philosophers, the nineteenth the age of apostles and prophets. To satisfy the nineteenth century, it is necessary to be the painter of the sixteenth, the writer of the seventeenth, the philosopher of the eighteenth; and it is also necessary, like Louis Blane, to have the innate and holy love of humanity which constitutes an apostolate, and opens up a prophetic vista into the future. In the twentieth century war will be dead, the scaffold will be dead, animosity will be dead, royalty will be dead, and dogmas will be dead; but Man will live. For all there will be but one country—that country the whole earth; for all there will be but one hope—that hope the whole heaven.

 

Victor Hugo

 

The materialist critics argue that insuperable difficulties are encountered by the hypothesis that immaterial mental events can act in any way on material structures such as neurons. Such a presumed action is alleged to be incompatible with the conservation laws of physics, in particular of the first law of thermodynamics. This objection would certainly be sustained by nineteenth century physicists, and by neuroscientists and philosophers who are still ideologically in the physics of the nineteenth century, not recognizing the revolution wrought by quantum physicists in the twentieth century.

 

John Carew Eccles

 

The nineteenth century believed in science but the twentieth century does not.

 

Gertrude Stein

 

In the eighteenth century it was often convenient to regard man as a clockwork automaton. In the nineteenth century, with Newtonian physics pretty well assimilated and a lot of work in thermodynamics going on, man was looked on as a heat engine, about 40 per cent efficient. Now in the twentieth century, with nuclear and subatomic physics a going thing, man had become something which absorbs X-rays, gamma rays and neutrons.

 

Thomas Pynchon