《汉书·传·楚元王传》
现在发出了善令，没过三个月又收回了，这是收回已出之汗；用贤臣不到三旬便斥退，这是转动石头。
今出善令，未能逾时而反，是反汗也；用贤未能三旬而退，是转石也。
Now a good order is issued, and it is withdrawn after fewer than 3 months. It is like withdrawing sweat that has already come out. Use a wise man for fewer than 30 days and then dismiss him, it is like turning a stone.