Carl von Clausewitz’s Vom Kriege, On War, was published after his death, from 1832 to 1834. In the chapter on military genius he defines a strong mind. Ein starkes Gemüt ist nicht ein solches, welches bloß starker Regungen fähig ist, sondern dasjenige, welches bei den stärksten Regungen im Gleichgewicht bleibt. A strong mind is not one that is merely capable of strong emotions. It is one that stays in balance during the strongest emotions. Clausewitz gives an image for it. Despite the storms in the chest, insight and conviction keep their free movement, like the needle of a compass on a ship in a storm. He calls the power behind it Selbstbeherrschung, self-control. It is the power to submit to reason even in moments of the most violent emotion.