肇論新疏 3.106

3.106

無異杜耳目於胎㲉（卵）、掩玄（夫）象於霄外，而責夫宮商之異、辨緇素之殊者也。

"This is no different from blocking the ears and eyes within an eggshell or concealing the heavenly luminaries beyond the firmament, while demanding the distinction between the notes gong and shang or discerning the difference between black and white."