《资治通鉴·汉纪·汉纪三十五》
由此看来，减轻刑罚的作法，反而酿成大祸。对奸诈不轨的人施恩，就是伤害善良的人。 
由此观之，则刑轻之作，反生大患，惠加奸轨，而害及良善也！ 
From this we can see that reducing punishments actually leads to great disaster. If you show mercy to scheming and crooked people, you are hurting good people. 