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Sun Tzu Quotes

The army's formation is like water. The water's formation avoids
the high and rushes to the low. So an army's formation avoids the
strong and rushes to the weak. Water's formation adapts to the
ground when flowing. So then an army's formation adapts to the
enemy to achieve victory. Therefore, an army does not have
constant force, or have constant formation. Those who are able to
adapt and change in accord with the enemy and achieve victory are
called divine. Therefore, of the five elements, none a constant
victor, of the four seasons, none has constant position; the sun
has short and long spans, and the moon waxes and wanes.
                -- Sun Tsu, "The Art of War"