大般涅槃經集解 55.74

55.74

案僧亮曰：信心聽法互為因果，不得相離，指據此二為因因果果也。

Sengliang comments: Faith and listening to the Dharma serve mutually as cause and effect and cannot be separated; this points to and relies on these two as the cause of a cause and the fruit of a fruit.