justice is tempered with mercy ❍ 宰相道：“陛下，只有～，方能大治天下。”“Your Majesty,only when justice is tempered with mercy can great order be brought across the land，” said the prime minister.
恩威并用en wei bing yong
make a combined use of favour and disfayour (as in controlling one’s subordinates)
恩威并用
use both the carrot and the stick;resort to both benevolence and severity;combine justice and mercy