"The authorities are fascinated, the bystanders are clear" comes from the old Tang book Yuan Xing Chong Chuan. For example, the parties to a matter often think too much about gains and losses, and their understanding is not comprehensive, but they are not as clear as the onlookers.
"I don't know the true face of Lushan Mountain, but toward which corner of the mountain" comes from Su Shi's poem "Topic Xilin Wall". I can't recognize the true face of Lushan Mountain because I am in it.