妙法蓮華經玄義 2.109

2.109

有而非支。無明有因，謂不正思惟；老死有果，謂憂悲。又無明有因，謂老死；老死有果，謂無明。現在愛、取，是過去無明；現在名色、六入、觸、受，此四若在未來，名老死。如說受緣愛，當知說老死緣無明也。猶如車輪，更互相因也。

They exist, but are not links. Ignorance has a cause, namely improper reflection; aging and death have a fruit, namely grief and lamentation. Furthermore, ignorance has a cause, namely aging and death; aging and death have a fruit, namely ignorance. Present craving and grasping are past ignorance; present name-and-form, the six sense bases, contact, and feeling—if these four are in the future, they are named aging and death. When it is said that feeling conditions craving, one should know it also says that aging and death condition ignorance, like the wheel of a cart, mutually causing one another.