師 Shi

Discussion:

During war times, government and army has to be united as a system to ensure a chance for victory.

The reason for war has to be a righteous one.

A leader has to have foresight and be agile in the use of strategy according to the situation.

〈師〉卦的內容是在描述戰爭理論。卦辭表明，政治因素和軍事因素的統一，決定著戰爭的勝負。

依據《彖傳》和交辭的闡述，政治因素是指戰爭的性質是否屬於正義。在《易經》編定的時代，國家沒有職業性的常備軍，而是寓兵於民，兵民合一。

戰爭勝負，直接關係到百姓是否擁護-以及戰爭過程中有沒有足夠的可戰之兵。

至於軍事因素，〈師〉卦講得更多。首先重視統帥的選擇，認為前線統帥要有威望，指揮權千萬不能旁落。其次是紀律嚴明，失律就等於失敗.，戰術要隨機應變，靈活運用。