成唯識論掌中樞要 2.253

2.253

第三地闇能障，於所聞、思修法忘失者：何故初地名已得不退，此猶忘耶？又《菩薩地》云：勝解行位於久所作、所思所說法有時忘失，入地不爾，如何今說有忘失耶？定位所得，多分忘失，地前猶有，地上咸無，名證不退。其聞、思、修所得，猶小有退忘，非多。又無漏所得無忘，有漏所得三惠境猶忘，亦不相違。三定成無也，又應不是退也。

Regarding the darkness of the third bhūmi being able to obstruct, causing forgetfulness of dharmas heard, reflected upon, and cultivated: why is the first bhūmi called "having already attained non-retrogression", yet here there is still forgetting? Furthermore, the Bodhisattvabhūmi states: at the stage of practice with resolute faith (adhimukti-caryā-bhūmi), one sometimes forgets dharmas performed, reflected upon, and explained long ago, but upon entering the bhūmis it is not so; why does it now say there is forgetting? That which is attained in meditative concentration is mostly forgotten before the bhūmis, whereas upon the bhūmis it is completely absent; this is called realisation of non-retrogression. As for what is attained through hearing, reflection, and cultivation, there is still slight retrogression and forgetfulness, but not much. Furthermore, what is attained via anāsrava has no forgetfulness, whereas the objects of the three wisdoms attained via sāsrava are still forgotten; thus they do not contradict each other. In the three concentrations, it is definitively absent; moreover, it should not be considered retrogression.