Sun Tzu (孫子 Sūn Zǐ; c. 6th century BC) was a Chinese general, military strategist, and philosopher who lived in the Eastern Zhou period of ancient China. Sun Tzu is traditionally credited as the author of The Art of War, a widely influential work of military strategy that has affected both Western and East Asian philosophy and military thinking. He is also known as Sun Wu (孫武; Sūn Wǔ), and Chang Qing (長卿; Cháng Qīng).
The good fighters of old first put themselves beyond the possibility of defeat, and then waited for an opportunity of defeating the enemy.
It is only the enlightened ruler and the wise general who will use the highest intelligence of the army for the purposes of spying, and thereby they achieve great results.