《易传·象传下·丰》
 虽然合作十天也不致受害 ，但是过了十天就可能会有灾祸。 能以自己的至诚之心去启迪 ，是有信以展拓其盛大之志。 光明被云遮掩 ，不可成就胜任大事； 右臂折断而无为慎守 ，最终得不到重用或不可能有所作用了。 光明遭到云的蒙蔽 ，是说九四爻所居的爻位不当； 明亮的白天却看到了夜晚的北斗星 ，说明由于蒙蔽而出现昏暗； 但若遇到明主赏识 ，行动还是会获得吉祥的。
有孚发若，信以发志也。丰其沛，不可大事也。折其右肱，终不可用也。丰其蔀，位不当也。日中见斗，幽不明也。遇其夷主，吉行也。
Although there will be no harm in cooperating for ten days, there may be disaster after ten days. Being able to inspire with one's own sincerity to display its grand ambition. The light is obscured by clouds, making it impossible to accomplish great things; the right arm is broken and there is nothing to be careful about, and it will eventually not be reused or impossible to do anything. The light is obscured by clouds, saying that the position of the nine-fourth line is improper; the bright daylight but see the北斗星 at night, indicating the darkness caused by the cover; but if you meet the appreciation of the wise master, your actions will still be auspicious.