維摩經玄疏 2.136

2.136

答曰：《法華》的據盡、無生，三乘有為無漏功德是究竟三乘，能運入無餘涅槃，乃是真乘。既無無餘涅槃之可入，又不能運至常住涅槃，則三乘之義不成，故索三車不得也。今通明「乘」義，有六種不同：一、理乘；二、教乘；三、行乘；四、相似乘；五、分證真實乘；六、究竟乘。

Answer: The Lotus Sūtra specifically relies on the conditioned uncontaminated merits of exhaustion and non-arising of the three vehicles as the ultimate three vehicles, which can convey [one] into nirvāṇa without remainder and are the true vehicles. Since there is no nirvāṇa without remainder to be entered, and moreover they cannot convey [one] to eternal nirvāṇa, the meaning of the three vehicles is not established; hence they seek the three carts in vain. Now, to explain the meaning of 'vehicle' generally, there are six different kinds: first, the vehicle of principle; second, the vehicle of teaching; third, the vehicle of practice; fourth, the vehicle of resemblance; fifth, the vehicle of partial realization of the real; sixth, the ultimate vehicle.