維摩經玄疏 6.23

6.23

二、約共說般若別教明空不空辨法性同異者，《涅槃經》云：「第一義空，名為智慧。智者見空，及與不空；聲聞、辟支佛，但見於空，不見不空。」聲聞、菩薩同見於空，是則法性理一，名之為同；菩薩能見不空，不空即是智慧之性，名見佛性，即是異也。譬如三獸渡河，二獸浮渡，但知水軟；若象浮渡，出沒到底，浮知水軟，到底著地，知非軟也。

Second, discerning the similarity and difference of dharma-nature in terms of the expounding of prajñā shared [with the two vehicles] under the distinctive teaching by clarifying the empty and the non-empty: the Nirvāṇa Sūtra says: 'Supreme emptiness is called wisdom. The wise see the empty as well as the non-empty; the śrāvakas and pratyekabuddhas see only the empty and do not see the non-empty.' Śrāvakas and bodhisattvas alike see emptiness; thus the principle of dharma-nature is one, which is called 'similarity.' The bodhisattva can see the non-empty, and the non-empty is precisely the nature of wisdom, called seeing buddha-nature; this is the 'difference.' It is like three beasts crossing a river: two beasts cross by floating and know only that the water is yielding; if an elephant crosses by floating, dipping down to the bottom, floating it knows the water is yielding, and reaching the bottom it touches the ground and knows it is not yielding.