分別功德論 4.34

4.34

所以稱陀多索比丘樂空者，此比丘入屋解內空、出屋解外空，內空喻識、外空喻身，入屋達識空、出屋解身空。已了內外空，諸法亦如是。此比丘聞說空教戢在心懷，入屋見空即達身識。餘比丘者，結盡然後達空，空心難獲。貴其先得，故稱第一。

The reason why Bhikṣu Dattaśūra was praised for delighting in emptiness is that this bhikṣu understood internal emptiness upon entering a room, and understood external emptiness upon leaving a room: internal emptiness corresponds to consciousness, and external emptiness corresponds to the body; entering the room he penetrated the emptiness of consciousness, and leaving the room he understood the emptiness of the body. Having already comprehended internal and external emptiness, all dharmas are likewise so. When this bhikṣu heard the teaching of emptiness expounded, he kept it stored in his heart; entering the room and seeing emptiness, he immediately penetrated body and consciousness. Other bhikṣus penetrate emptiness only after their fetters are exhausted, for the mind of emptiness is difficult to attain. Valued for attaining it first, he was therefore praised as foremost.