《管子·七主七臣》
事事部自己处理则事务繁多。事多则昏愦，昏愦则无论事之缓急都置而不行了。
尽自治其事则事多，多则昏，昏则缓急俱植。
If he personally handles everything, then there will be too many affairs to deal with. If there are too many affairs, then he will become confused. If he is confused, then he will not do anything, no matter how urgent or not urgent the affairs are.