The duty of man is the same in respect to his own nature as in respect to the nature of all other things, namely not to follow it but to amend it.

John Stuart Mill makes this remark in the course of criticizing the common moral appeal to “nature” as a guide to conduct. Writing in the mid–19th century, Mill argues against the idea—popular in religious and romantic moralizing—that what is “natural” is therefore good, right, or authoritative. In his essay “Nature,” he treats nature as indifferent to human welfare: it produces suffering and cruelty as readily as beauty and order. Against this backdrop, Mill contends that civilization and morality consist precisely in correcting, restraining, and improving what nature gives us, rather than treating it as a moral standard.

Mill’s point is that “nature” is descriptive, not prescriptive. Human impulses and the wider natural world contain both admirable and harmful tendencies; therefore, simply “following nature” cannot be a reliable ethical rule. Instead, our duty is reformative: to use reason, sympathy, and social institutions to mitigate natural evils (disease, scarcity, violence) and to cultivate better habits and characters. The line also targets the fallacy that moral norms can be read off from biological or customary facts. For Mill, progress—personal and political—means amending nature through education, law, and deliberate self-governance.