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During the enlightenment there are profound differences of opinion. But there is a sense that human progress and social progress for the vast majority was both possible and desirable.
There is the Baconian program with many scientists working in its name. There is the Lockean idea that wealth is the product of human creativity and that therefore, it is in principle unlimited, i.e. poverty can be eliminated. Many were inspired by this idea.
By the end of the 18th century we see Montesquieu cited as the Francis Bacon of the study of man and society, while Adam Smith was the Newton.
This is an episode where we trace out many of the channels that connected Enlightenment ideals to the people in the Industrial Revolution, who did all the things.