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.
Carl von ClausewitzRather than comparing [war] to art we could more accurately compare it to commerce, which is also a conflict of human interests and activities; and it is still closer to politics, which in turn may be considered as a kind of commerce on a larger scale.
Carl von ClausewitzWe repeat again: strength of character does not consist solely in having powerful feelings, but in maintaining oneโs balance in spite of them. Even with the violence of emotion, judgment and principle must still function like a shipโs compass, which records the slightest variations however rough the sea.
Carl von Clausewitz