俱舍論記 23.16

23.16

「毘婆沙師至由楔力持」者，答。斧由楔持能破於木，慧由念持於境得轉，此即從因為名。

Regarding "The masters of the Vibhāṣā ... supported by the power of a wedge": this is the answer. An axe, supported by a wedge, is able to split wood; prajñā, supported by mindfulness, is able to operate with respect to an object. This is naming it after its cause.