唯識二十論述記 2.375

2.375

述曰：此釋非已所能思議。「尋思」者，有分別有漏心等，或四尋伺。其唯識理，要得無漏真智覺時，方能少證。若在佛位，證乃圓明。然我世親處在地前，住尋思位，不能如實證唯識理，故非是我之所思議，其唯識理，超尋思境。以上總釋頌難思字。

Commentary: This explains why they are not conceivable by oneself. 'Discursive thought' (vitarka) refers to conceptual, contaminated minds and the like, or the four investigations (paryeṣaṇā). As for the principles of vijñapti-mātra, only when one attains awakening through uncontaminated true wisdom can one partially realize them. In the stage of a Buddha, the realization is fully luminous. However, I, Vasubandhu, reside prior to the bhūmis, abiding in the stage of discursive thought, and cannot truly realize the principles of vijñapti-mātra as they are; therefore they are not what I can conceive. The principles of vijñapti-mātra transcend the sphere of discursive thought. The above generally explains the word 'inconceivable' in the verse.