Question

This core value of the Enlightenment thinkers said that over time humankind can and should improve

Answer 1

Reason or logic reasoning.

Step-by-step explanation:

The core value to Enlightenment thinkers was logic reasoning, they didn't concerned about religion and that stuff, because they didn't believe that's the way to improve humankind.

So, in order to achieve constant improvement they use reason and logic reasoning, that's why they valued so much science, life, liberty and property.

Answer 2

Enlightenment thinkers believed in using logic and reason in their decisions. This would mean that they wanted to improve humans with these very same ideas.