俱舍論疏 27.121

27.121

論「初三別緣至無如是能」，答也。「初三別緣色為境故」者，天眼、天耳、神境別緣色故。無色近分雖緣下色，總而無別修他心通，憶時以色為門故。宿住通漸次憶念色之分位差別成故，成時復緣處、性等故。依無色地無如是能，是故立通不依無色。

The Śāstra states: "Because the first three distinctively take matter as object up to lacking such capacity," this is the answer. "Because the first three distinctively take matter as object" means that the divine eye, divine ear, and supernormal power distinctively take matter as object. Although the preliminary stage of the formless realm takes lower matter as object, it is general and not distinct. In cultivating the supernormal knowledge of others' minds, when recollecting, matter serves as the doorway. The supernormal knowledge of previous lives is established by gradually recollecting the distinctive states of matter; when established, it further takes the āyatanas, natures, and so forth as object. Relying on the level of the formless realm lacks such capacity; therefore the established supernormal knowledges do not rely on the formless realm.