俱舍論頌疏論本 2.94

2.94

釋曰：欲釋此頌，且要先知身、眼、色三皆通五地，謂在欲界及四靜慮。眼識唯在欲界初禪。眼不下於身者，眼根望身，或等或上，終不居下。且欲界眼見欲界色，此即眼與身等（等同地故言等）。身在欲界，獲四禪眼，是即眼有身上。決定無有身居上地，起下地眼，以生上地自有勝眼，故不須起下地劣眼，故眼於身終不居下。

The explanation says: To explain this verse, one must first know that the three—body, eye, and form—all pertain to five levels: namely, in the desire realm and the four dhyānas. Eye-consciousness exists only in the desire realm and the first dhyāna.

'The eye is not lower than the body': when viewing the eye faculty in relation to the body, it is either equal or superior; it never resides below. Now, when an eye of the desire realm sees form of the desire realm, this is the eye being equal to the body ('equal' is said because they are of the same level). When the body is in the desire realm and one attains an eye of the four dhyānas, this is the eye being above the body. There is definitely never a case where, with the body residing on a higher level, one gives rise to an eye of a lower level; because when born on a higher level one naturally has a superior eye, there is no need to give rise to an inferior eye of a lower level. Therefore, the eye never resides below the body.