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Sun Tzu Quotes

Use the ground for assistance. When the rainwater rises and
descends down to where you want to cross, wait until it settles.
Where there are ground with impassable ravines, Heaven's Wells,
Heaven's Prisons, Heaven's Nets, Heaven's Pits, and Heaven's
Fissures, you must march quickly away from them. Do not approach
them. When we distance from them, draw the enemy to approach
them. When we move to face the enemy, he will have them at his
back. When the army is flanked by high ground, wetlands, tall
reeds and grass, mountain forests, or areas with thick
undergrowth, you must search carefully and thoroughly, because
these are places where men lie in ambush or where spies hide.
                -- Sun Tsu, "The Art of War"