The Durants define progress not as the increase in speed or power, but as the "enlargement of our heritage." True progress is the accumulation and transmission of culture, knowledge, and morals to the next generation. History’s greatest lesson is that while the players change, the play remains the same.
Civilizations are not permanent. They are born, grow, flourish, and eventually decay. This decay usually happens from within—through the loss of social cohesion, moral decay, or the failure of leadership—before a physical "conquest" from the outside finishes the job. Conclusion: What is Progress? The Lessons of History
The authors argue that history is a biological process. We are subject to the same laws as other organisms: The Durants define progress not as the increase
Religion is viewed as a necessary tool for social stability. It provides a supernatural sanction for moral codes that would otherwise be difficult to enforce among the masses. The Durants note that even when "heaven" is replaced by "utopia," the social function remains the same. They are born, grow, flourish, and eventually decay
Democracy is a relatively recent and fragile experiment. The authors suggest that it requires a high level of education and economic security to function. They warn that liberty and equality are "born enemies"—as liberty increases, so does inequality; to enforce equality, liberty must be sacrificed.
Redistribution occurs, either through (reform) or revolution (violence).