Ultimately a global steward, a progressive is one who works for the gradual advancement of human interest and endeavor by innovating, articulating, and demonstrating those policies, ideas, and methods which will benefit the greatest number while incurring the fewest possible social, economic, and ecological consequences.

Keywords from above, used in other answers:

advance | advancement | benefit | consequences | economic | global | greatest | human | idea | ideas | man | men | one | policies | progress | progressive | social | we | work
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