Source, in full
Sun Tzu among many other military thinkers and leaders believed in fate and determination from the correct application of theory, the state of the opponent's and one's own power, and a code for the general and a code for the soldier to follow, rather than the Machiavellian type of intuition that evokes an evolution of opportunism that brought great historical consequences as it dominated over the classical and medieval ethical doctrines. Thus this statement is contrary to Sun Tzu principles. Nevertheless, there is a possible relation to the quote: Quickness is the essence of the war.