《资治通鉴·唐纪·唐纪四十二》
刘晏说： 不是这样。办大事，当然不可吝惜小费用，办一切事情都要有长远的考虑。
晏曰： 不然，论大计者固不可惜小费，凡事必为永久之虑。
Liu Yan said: This is not the case. For big things, of course, small expenses should not be spared, and everything should be considered for a long time.