vol 37, p269c
cf. Cullavagga 5.3
That is a fairly late interpretation that fuses Madhyamaka with Yogacara and Pramana, furthermore, it does not specify the methods used.
I don't think that's a problem, since it is not important in Zen except for some advocates of gradual practice. The point still remains, however, that to have the bodhisattva motivation one needs some level of faith and understanding as well.