《资治通鉴·秦纪·秦纪一》
如今楚王病重，随时都会死去，一旦病故，您即可辅助幼主，从而掌握国家大权，待幼主成年后再还政给他，或者干脆就面南而坐，自称为王。这便是所谓的 未预料到而来的洪福 了 。
王今病，旦暮薨，薨而君相幼主，因而当国，王长而反政，不即遂南面称孤，此所谓无望之福也。 
"Now the king of Chu is seriously ill and could die at any time. Once he passes away, you can immediately assist the young Lord and thereby control the power of the state. Then when the young Lord grows up, you can return political power to him or else simply sit facing south and proclaim yourself king. That is what is meant by 'good fortune that one cannot predict'."