成唯識論演祕 2.814

2.814

具如《樞要》。有義謂通外難，外難云：若言詮法不得自相，如何喚火便得火等？故此通云，謂假智詮雖不得自相，亦非離此自相之外，有別方便施設自相為假所依。由詮火名無始串習，依火自相不依於水，假智隨名但緣於火，且如假名詮法自相，雖不稱實，要杖所詮自相施設；假智亦爾，不離自相假智生故。

This is fully explained in the Shuyao. One opinion holds that this resolves an opponent's objection. The opponent objects: "If you say that expressions denoting dharmas do not attain the specific characteristic, how is it that when calling for fire one obtains fire, and so forth?" Therefore this resolves it by saying: Although designated cognition and expression do not attain the specific characteristic, neither is it that apart from this specific characteristic there is another expedient means positing a specific characteristic to serve as the basis of designation. Because of beginningless habituation to the name expressing fire, it is based on the specific characteristic of fire and not on water; designated cognition, following the name, cognizes only fire. Just as a designated name expresses the specific characteristic of a dharma, although it does not tally with the real, it must rely on the expressed specific characteristic to be posited; designated cognition is likewise, because designated cognition arises without being separate from the specific characteristic.