桓公问管子曰:“有虞策乘马已行矣,吾欲立策乘马,为之奈何?”管子对曰:“战国①修其城池之功,故其国常失其地用,王国则以时行也”。桓公曰:“何谓以时行?”管子对曰:“出准之令②,守地用人策,故开阖皆在上...