Carl von Clausewitz

Pity the theory which sets itself in opposition to the mind! It cannot repair this contradiction by any humility, and the humbler it is so much the sooner will ridicule and contempt drive it from real life.

...an intellectual instinct which extracts the essence from the phenomena of life, as a bee sucks honey from a flower. In addition to study and reflections, life itself serves as a source.

but the disadvantages of this position must naturally not be of a transitory nature, at least in appearance, otherwise the enemy, instead of yielding, will hold out, in the prospect of a change for the better.

Dans les deux cas, l’empereur Napoléon attaqua avec son aile droite en cherchant à résister avec l’aile gauche. L'archiduc Charlesdfit exactement la même chose. Mais le premier le fit avec toute sa résolution et toute son énergie, tandis que le second était indécis et s’arrêtait chaque fois à mi-course.

The commander's talents are given greatest scope in rough hilly country. Mountains allow him too little real command over his scattered units and he is unable to control them all; in open country, control is a simple matter and does not test his ability to the fullest.

A people can value nothing more highly than the dignity and liberty of its existence, that it must defend these to the last drop of its blood, so there is no higher duty to fulfil, no higher law to obey, that the shameful blood of cowardly submission can never be erased, that this drop of poisoning in the blood of a nation is passed on to posterity, crippling and eroding the strength of future generations.

[T]hose who are difficult to move, but on that account susceptible of very deep feelings, men who stand in the same relation to the preceding as red heat to a flame, are the best adapted by means of their Titanic strength to roll away the enormous masses by which we may figuratively represent the difficulties which beset command in War. The effect of their feelings is like the movement of a great body, slower, but more irresistible.

[...] We therefore say once more a strong mind is not one that is merely susceptible of strong excitement, but one which can maintain its serenity under the most powerful excitement, so that, in spite of the storm in the breast, the perception and judgment can act with perfect freedom, like the needle of the compass in the storm-tossed ship.

Die beste Strategie ist: immer recht stark sein, ... . Daher gibt es ... kein höheres und einfacheres Gesetz für die Strategie als das: seine Kräfte zusammenhalten.

...as man under pressure tends to give in to physical and intellectual weakness, only great strength of will can lead to the objective.

Boldness governed by superior intellect is the mark of a hero.

PRINCIPLE is likewise such a law for action, except that it has not the formal definite meaning, but is only the spirit and sense of law in order to leave the judgment more freedom of application when the diversity of the real world cannot be laid hold of under the definite form of a law.

...in war, the advantages and disadvantages of a single action could only be determined by the final balance.

(1) War becomes a completely isolated act, which arises suddenly, and is in no way connected with the previous history of the combatant States. (2) If it is limited to a single solution, or to several simultaneous solutions. (3) If it contains within itself the solution perfect and complete, free from any reaction upon it, through a calculation beforehand of the political situation which will follow from it.

War is such a dangerous business that mistakes that come from kindness are the very worst.

Theory must also take into account the human element; it must accord a place to courage, to boldness, even to rashness.