let your methods be regulated by the infinite variety of circumstances.
[As Wang Hsi sagely remarks: "There is but one root-principle
underlying victory, but the tactics which lead up to it are infinite in
number." With this compare Col. Henderson: "The rules of strategy are
few and simple. They may be learned in a week. They may be taught by
familiar illustrations or a dozen diagrams. But such knowledge will no
more teach a man to lead an army like Napoleon than a knowledge of
grammar will teach him to write like Gibbon."]