《礼记·杂记下》
让民众一味紧张而没有一天轻松，即使文王、武王也不能把天下治理得好；让民众一味轻松而没有一天紧张，文王、武王也不会这么办。
张而不弛，文武弗能也；弛而不张，文武弗为也。
Keeping the people alert and active without giving them a day of relaxation, even King Wen and King Wu could not govern the world well; keeping the people relaxed and at ease without giving them a day of work, King Wen and King Wu would not do so either.