Conn Iggulden said this quote
“ There are many who say ‘I believe this,’ but would they hold true to those beliefs if their children were threatened? No. But Genghis would. If you told him you would kill his children, he would tell you to go ahead, but realize that the cost would be infinite, that he would tear down cities and nations and the price would never be paid. He did not lie and his enemies knew it. His word was iron. ”