“Six Secret Strategic Teachings”, one of the Seven Military Classics of ancient China [[武經七書|武经七书<WǔjīngQīshū>]], attributed to Jiang Ziya [[薑子牙|姜子牙<JiāngZǐyá>]]

military strategy

Qin Taoyu, Tang poet, author of long poem Poor Woman [[貧女詩|贫女诗<pínnǚshī>]]

Zou Taofen (1895-1944), journalist, political theorist and publisher

"Six Secret Strategic Teachings" [[六韜|六韬<Liùtāo>]] and "Three Strategies of Huang Shigong" [[三略<Sānlüè>]], two of the Seven Military Classics of ancient China [[武經七書|武经七书<WǔjīngQīshū>]], attributed to Jiang Ziya [[薑子牙|姜子牙<JiāngZǐyá>]]

to conceal one's strengths and bide one's time (idiom)