妙法蓮華經文句 4.52

4.52

是他人立義，今為其通。譬如燈生闇滅，不可定其前後，雖不前後，闇定是障（云云）。

This was a proposition established by others; now I will resolve it for them. Just as when a lamp arises and darkness ceases, one cannot fix an order of prior and posterior; yet even though there is no prior and posterior, darkness is definitively an obstruction (and so on).