Thoreau argues that when a government uses imprisonment to enforce injustice, a person committed to justice may have a moral duty to resist rather than cooperate. In such circumstances, prison becomes not merely a punishment imposed by the state, but a possible consequence of acting according to conscience.

Within Resistance to Civil Government, the statement reflects Thoreau’s broader view that individuals should not allow legal authority to override their judgement about right and wrong. His point is deliberately stark: if the state punishes people for resisting injustice, then imprisonment can mark a refusal to participate in that injustice. The passage therefore links personal conscience with political resistance and challenges the assumption that lawful punishment necessarily indicates wrongdoing. It presents civil disobedience as a willingness to accept legal penalties when obedience would, in Thoreau’s view, amount to complicity in an unjust system.