首楞嚴義疏注經 4.19

4.19

攸，所也。據說則本然清淨，互遍互融；據今則宛爾山河，碩乖水火。莫知所往，孰是孰非，願垂慈誨，冀無所惑。

"You" (攸) means place (所). According to the teaching, it is fundamentally pure, mutually pervading and mutually fusing; according to the present [perception], there are clearly mountains and rivers, and water and fire sharply conflict. Not knowing where it leads, what is right and what is wrong, he prays for compassionate instruction, hoping to be free of confusion.