大方廣佛華嚴經隨疏演義鈔 62.9

62.9

疏「著欲」等者，由著欲故有於欲界；由著受故有於色界，四禪不出於四受故。又著正受故，由著想故有無色界。空想、識想、無所有想、非想非非想中，雖欲絕想，亦不出想。「三界唯心」，總結上文，如下六地。

Regarding the Commentary's "clinging to desire" and so on: due to clinging to desire, there is the desire realm; due to clinging to sensation, there is the form realm, because the four dhyānas do not depart from the four sensations. Furthermore, due to clinging to proper attainment and due to clinging to ideation, there is the formless realm. Within the ideation of empty space, the ideation of consciousness, the ideation of nothingness, and neither ideation nor non-ideation, although one desires to sever ideation, one still does not depart from ideation. "The three realms are mind-only" summarizes the text above, as in the sixth bhūmi below.