請觀音經疏闡義鈔 1.43

1.43

「佛界須料揀」者，應問云：九界可爾，佛界云何請耶？應答云：名字、觀行即佛，為除分段三障故，須請分證之觀音；相似即佛，為除變易三障亦爾。於分證中位位互作，乃至等覺，為除三障請究竟觀音。此約圓中五即俱名佛界也。若剋取究竟位為能請者，以眾生斷惡機在觀音，故須請也。則如經云「爾時世尊憐愍眾生覆護一切，重請觀世音菩薩」等。

"The buddha realm requires discrimination": one should ask, "The nine realms may be so, but how can the buddha realm invoke?" One should answer: buddhas of nominal and contemplative identity, to eliminate the three obstacles of fragmentary [samsāra], must invoke Avalokiteśvara of partial realization; buddhas of resemblance identity, to eliminate the three obstacles of change-transformation [samsāra], are also like this. Within partial realization, stages mutually perform this, up to equal enlightenment, where they invoke the ultimate Avalokiteśvara to eliminate the three obstacles. This is in terms of all five identities within the perfect teaching being named the buddha realm. If strictly taking the ultimate stage as the one able to invoke, it is because sentient beings' capacity to sever evil relies on Avalokiteśvara, hence [the Buddha] must invoke him; as the sūtra says: "At that time the World-Honoured One, pitying sentient beings and sheltering all, repeatedly invoked Avalokiteśvara Bodhisattva..."