俱舍論頌疏論本 23.17

23.17

次生頂亦然者，修煗善根有下、中、上，至成滿時，有善根生，名為頂法，亦觀四諦，修十六行相，同前煗位，故言亦然。煗、頂二善根俱名動善，可退動故。動善根中頂為最勝，如人頂故，名為頂法。又忍位是進，煗位是退，此頂在進退兩際，猶如山頂，故名為頂。

As for "next arises the summit likewise": the cultivation of the root of goodness of warmth has inferior, middling, and superior grades; when reaching fulfillment, a root of goodness arises, which is named the 'dharma of the summit' (mūrdhan). It also contemplates the four truths and cultivates the sixteen modes, being identical to the preceding stage of warmth; hence it says 'likewise'. The two roots of goodness of warmth and summit are both called 'fluctuating goods' (cala-kuśala), because they can regress and fluctuate. Among the fluctuating roots of goodness, the summit is supreme, like a person's crown; hence it is named the 'dharma of the summit'. Furthermore, the stage of patience is advancement, while the stage of warmth is regression; this summit is at the boundary between advancement and regression, like a mountain peak; hence it is named 'summit'.