Action in war is like movement in a resistant element. Just as the simplest and most natural of movements, walking, cannot easily be performed in water, so in war it is difficult for normal efforts to achieve even moderate results.
Knowledge in war is very simple, being concerned with so few subjects, and only with their final results at that. But this does not make its application easy.
...any move made in a state of tension will be of more important, and will have more results, than it would have made in a state of eqilibrium. In times of maximum tension this importance will rise to an infinite degree.
Obstinacy is a fault of temperament. Stubbornness and intolerance of contradiction result from a special kind of egotism, which elevates above everything else the pleasure of its autonomous intellect, to which others must bow.