《易传·文言传·乾文言》
九三爻辞说： 君子始终是白天勤奋努力，夜晚戒惧反省，虽然处境艰难，终究没有灾难。 
九三曰： 君子终日乾乾，夕惕若厉，无咎。 
The third line says: The superior man works all day long And in the evening examines his conduct. He is in danger, but there will be no mistakes.