Reasonable men adapt to the world around them unreasonable men make the world adapt to them. The world is changed by unreasonable men.

The saying contrasts two temperaments: the “reasonable” person who accommodates existing conditions, and the “unreasonable” person who refuses to accept the world as given and instead presses it to change. In this framing, progress—social, political, technological, or personal—depends on a certain constructive stubbornness: the willingness to challenge norms, endure resistance, and insist on a different outcome. The line also implies a critique of mere adaptability when it becomes complacency. At the same time, it leaves open a moral question: “unreasonable” can describe visionary reformers, but also reckless ideologues. The quote’s force lies in reclaiming “unreasonable” as a driver of transformation.