摩訶止觀 3.121

3.121

次、三乘人同以無言說道斷煩惱。論諦離合者，俗諦則同，真諦則異。《大論》云：「空有二種：一、但空，二、不但空。」《大經》云：「二乘之人但見於空，不見不空。智者非但見空，能見不空；不空即大涅槃。」二乘但空，智如螢火；菩薩之人，智慧如日。既空異智別，則有兩諦之殊，而今合為一真諦。

Next, people of the three vehicles together sever defilements by means of the ineffable path. In discussing the separation and combination of the truths: the conventional truth is shared, but the ultimate truth differs. The Mahāprajñāpāramitopadeśa states: 'Emptiness has two kinds: first, mere emptiness; second, not-mere-emptiness.' The Mahāparinirvāṇa-sūtra states: 'People of the two vehicles only see emptiness, but do not see non-emptiness. The wise do not merely see emptiness, but can also see non-emptiness; non-emptiness is the great nirvāṇa.' The two vehicles have only mere emptiness, their wisdom like a firefly; bodhisattvas have wisdom like the sun. Since the emptiness is different and the wisdom is distinct, there are two separate truths, which are now combined into one ultimate truth.