唯識二十論述記 1.31

1.31

若攝諸境，皆從於心，名「唯識」者，真如既是識之實性，亦名「唯識」。此約三性。若依二諦，說亦有差別，四重各別：一、空有識；二、事理識；三、別總識；四、詮旨識，如《成唯識述記》中說。

If subsuming all objects under the mind is called 'vijñapti-mātra', since tathatā is the true nature of consciousness, it is also called 'vijñapti-mātra'. This is according to the three natures. If explained according to the two truths, there are also distinctions, four distinct levels: 1. consciousness of emptiness and existence; 2. consciousness of phenomena and principle; 3. consciousness of specific and general; 4. consciousness of expression and purport, as explained in the Cheng weishi lun shuji.