Literature from which period reflected the writers' beliefs that people were naturally good and had the power to change many things about the world?

The answer would be : Enlightenment period.

During this period, there were a lot of literatures that wrote in a non-confrontational manner that beliefs that people were naturally good and had the power to change many things about the world

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The three steps before modern english were indo-european, germanic, and old english. as peoples moved around the eurasian continent, their languages changed. throughout the ages, the languages became more specialized. as english has many germanic influences, it is easy to see how this was one of the forebears. also, old english was one of the main ancestors of the modern language, spoken in the 5th through about the 13th centuries.