 Now the reason why a ruler builds lofty inner walls and outer walls, looks carefully to the barring of doors and gates, is [to prepare against] the coming of invaders and bandits. But one who murders the ruler and takes his state does not necessarily climb over difficult walls and batter in barred doors and gates. [He may be one of the ministers, who] by limiting what the ruler sees and restricting what the ruler hears, seizes his government and monopolizes his commands, possesses his people and takes his state. (Creel 1974: 344, translation modified)