To discover how much of our ...

To discover how much of our resources must be mobilized for war, we must first examine our political aim and that of the enemy. We must gauge the strength and situation of the opposite state. We must gauge the character and abilities of its government and people and do the same in regard to our own. Finally, we must evaluate the political sympathies of other states and the effect the war may have on them.
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 Carl von Clausewitz

Quotes from the same author

After we have thought out everything carefully in advance and have sought and found without prejudice the most plausible plan, we must not be ready to abandon it at the slightest provocation. should this certainty be lacking, we must tell ourselves that nothing is accomplished in warfare without daring; that the nature of war certainly does not let us see at all times where we are going; that what is probable will always be probable though at the moment it may not seem so; and finally, that we cannot be readily ruined by a single error, if we have made reasonable preparations.
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 Carl von Clausewitz
The object of defense is preservation; and since it is easier to hold ground than to take it, defense is easier than attack. But defense has a passive purpose: preservation; and attack a positive one: conquest.... If defense is the stronger form of war, yet has a negative object, it follows that it should be used only so long as weakness compels, and be abandoned as soon as we are strong enough to pursue a positive object.
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 Carl von Clausewitz
Responsibility and danger do not tend to free or stimulate the average person's mind- rather the contrary; but wherever they do liberate an individual's judgement and confidence we can be sure that we are in the presence of exceptional ability.
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 Carl von Clausewitz
Pursue one great decisive aim with force and determination.
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 Carl von Clausewitz
There are very few men-and they are the exceptions-who are able to think and feel beyond the present moment
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 Carl von Clausewitz