摩訶止觀 6.11

6.11

次、破色界九品者，或用世智，或用無漏智。如慧解脫人亦無世禪，但用無漏得成無學。初果無禪者，進修重慮理，用無漏智也。若俱解脫人，或用無漏智，或用世智。今且依世智，約得禪者為便。

Next, destroying the nine grades of the form realm uses either worldly knowledge or uncontaminated knowledge. For example, a person liberated through wisdom also has no worldly dhyāna, but merely uses uncontaminated [knowledge] to attain the state of non-learner. A person of the first fruit who has no dhyāna advances in cultivation and re-reflects on the principle, using uncontaminated knowledge. If it is a person liberated both ways, they use either uncontaminated knowledge or worldly knowledge. Now we temporarily rely on worldly knowledge, taking those who have attained dhyāna as convenient.