大方廣圓覺修多羅了義經略疏 1.115

1.115

言諸宗所詮分齊者，謂人天乘唯齊業報，小乘唯後四麁，法相極於三細，終頓通詮本末方窮初一心源。初一心源，即此經圓覺妙心也，經標圓覺為宗本故、說染淨法皆從覺心所現起故。

As for the scope expounded by the various traditions: the vehicle of humans and gods extends only to karma and retribution; the Hīnayāna extends only to the last four coarse marks; the Faxiang reaches its limit at the three subtle marks; the final and sudden teachings thoroughly expound root and branch, only then exhausting the primary source of the One Mind. The primary source of the One Mind is directly the marvelous mind of perfect enlightenment of this sūtra, because the sūtra sets forth perfect enlightenment as its essential foundation, and says that all defiled and pure phenomena arise as manifestations from the enlightened mind.