摩訶止觀 7.21

7.21

答：一往然，二往不然。然者，無明即見思，何意非橫障？中智治一切，何不通橫塞？此是一往然義耳。若二往釋者，橫塞障近，不能塞竪通；橫通力弱，不能通竪塞；竪塞深遠，不作橫障；竪通對當別，不通於橫塞耳。

Answer: From one perspective, yes; from a second perspective, no. As for "yes": avidyā is precisely view and thought [delusions]—why would it not be a horizontal hindrance? Middle wisdom cures everything—why would it not open horizontal obstruction? This is the meaning of "yes" from the first perspective. If explaining from the second perspective: horizontal obstruction hinders what is proximate and cannot obstruct vertical opening; horizontal opening has weak power and cannot open vertical obstruction; vertical obstruction is profound and distant and does not form a horizontal hindrance; vertical opening corresponds to its specific counterpart and does not open horizontal obstruction.