好了---what is a secret in these 2 characters?

好了, Cao Xueqin wrote these two characters in a 好了song.
世人都晓神仙好，只有功名忘不了！ 古今将相在何方？荒冢一堆草没了！ 世人都晓神仙好，只有金银忘不了！ 终朝只恨聚无多，及到多时眼闭了！ 世人都晓神仙好，只有姣妻忘不了！ 君生日日说恩情，君死又随人去了！ 世人都晓神仙好，只有儿孙忘不了！ 痴心父母古来多，孝顺儿孙谁见了？
today I discovered a big secret in these two, will add it in my book.