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Sun Tzu Quotes

When doing battle, seek a quick victory. A protracted battle will
blunt weapons and dampen ardor. If troops lay siege to a walled
city, their strength will be exhausted. If the army is exposed to
a prolonged campaign, the nation's resources will not suffice.
When weapons are blunted, and ardor dampened, strength exhausted,
and resources depleted, the neighboring rulers will take
advantage of these complications. Then even the wisest of
counsels would not be able to avert the consequences that must
ensue. Therefore, I have heard of military campaigns that were
clumsy but swift, but I have never seen military campaigns that
were skilled but protracted. No nation has ever benefited from
protracted warfare. Therefore, if one is not fully cognizant of
the dangers inherent in doing battle, one cannot fully know the
benefits of doing battle.
                -- Sun Tsu, "The Art of War"