zhī jǐ zhī bǐ , bǎi zhàn bù dài
Know yourself and know your enemy, and you will never be defeated (idiom, from Sunzi's Art of War 孫子兵法|孙子兵法[Sūn zǐ Bīng fǎ]).
Wǔ jīng Qī Shū
Seven Military Classics of ancient China viz "Six Secret Strategic Teachings” 六韜|六韬[Lìu Tāo], “Methods of Sima” 司馬法|司马法[Sī mǎ Fǎ], ”Art of War” 孫子兵法|孙子兵法[Sūn zǐ Bīng Fǎ], “Wu-zi” 吳子|吴子[Wú zǐ], “Wei Liao-zi” 尉繚子|尉缭子[Wèi Liáo zi], ”Three Strategies of Huang Shigong” 黃石公三略|黄石公三略[Huáng Shí gōng Sān Lüè] and ”Duke Li of Wei answering Emperor Taizong of Tang” 唐太宗李衛公問對|唐太宗李卫公问对[Táng Tài zōng Lǐ Wèi Gōng Wèn Dùi]
Huáng Shí gōng Sān Lüè
”Three Strategies of Huang Shigong”, also known as Taigong Bing Fa 太公兵法[Tài gōng Bīng Fǎ], one of the Seven Military Classics of ancient China 武經七書|武经七书[Wǔ jīng Qī Shū], variously attributed to Jiang Ziya 薑子牙|姜子牙[Jiāng Zǐ yá], Huang Shigong 黃石公|黄石公[Huáng Shí gōng] or an anonymous author
tóu fa hú zi yī bǎ zhuā
lit. hair and beard all in one stroke
fig. to handle different things by the same method
one method to solve all problems
one size fits all