成唯識論演祕 7.625

7.625

釋曰：已解脫得與離繫得俱時而生，正證離繫果，故名「解脫」。猶如世間驅賊閉戶，故隨何品要俱二道。與大乘別，如前斷惑證滅別辨。

The explanation says: The acquisition of having already been liberated and the acquisition of disjunction arise simultaneously, directly realizing the fruit of disjunction; hence it is called "liberation." Just as in worldly life one expels a thief and shuts the door, so for any grade whatsoever, both paths are required. Its difference from the Mahāyāna is as previously analyzed separately regarding the severing of afflictions and realization of cessation.