Sun Tzu said: The art of war is of vital importance to the State. It is
a matter of life and death, a road either to safety or to ruin. Hence it
is a subject of inquiry which can on no account be neglected. The art of
war, then, is governed by five constant factors, to be taken into
account in one's deliberations, when seeking to determine the conditions
obtaining in the field. These are: (1) The Moral Law; (2) Heaven; (3)
Earth; (4) The Commander; (5) Method and discipline.