《三国志·魏书·任苏杜郑仓传》
苏则回答说： 如果陛下能使教化普及中原地区，德行能推广到沙漠地区，那这样的珍宝不用求取也会自己前来的；求取才能获得的，是不够珍贵的。 
则对曰： 若陛下化洽中国，德流沙漠，即不求自至；求而得之，不足贵也。 
Su Ze replied, “If Your Majesty can ensure that culture and education are widespread in China, and that morality spreads as far as the desert, then such treasures will come of their own accord without you having to seek them out. Those that you have to seek out to obtain are not precious enough.”