成唯識論了義燈 1.32

1.32

Answer: Because the faculties are ripe and the wisdom and awakening are pervasive. Because it clearly teaches the dharmas of emptiness and existence observed by the three vehicles, it is said to be for all. In the Prajñāpāramitā-sūtras, although the three vehicles each attain their own benefits, it does not yet clearly explain that dharmas are neither empty nor existent; therefore, it belongs to the second [period]. If in terms of sudden awakening, a single period may be established.