俱舍論疏 21.77

21.77

論「應知此三至非色無色」，答也。以唯不善，立為五蓋。上非不善，故不立蓋。《正理論》云「為顯惛沈、掉舉二種，唯欲界者有立為蓋。故與眠、悔和合而立，眠、悔唯是欲界繫故。為顯眠、悔唯染污者有得蓋名，故與惛沈、掉舉二種和合而立，惛、掉唯是染污性故。疑准前四，在欲可知。」

The treatise says, "It should be known that these three […] not of the form or formless [realms]," which is the answer. Because they are exclusively unwholesome, they are established as the five hindrances (nīvaraṇa). Those of the higher [realms] are not unwholesome, and therefore are not established as hindrances. The Nyāyānusāra states: "In order to show that only those kinds of lethargy (styāna) and restlessness (auddhatya) that belong to the desire realm are established as hindrances, they are established in combination with drowsiness (middha) and regret (kaukṛtya), because drowsiness and regret are bound exclusively to the desire realm. In order to show that drowsiness and regret receive the designation of hindrance only when they are defiled, they are established in combination with lethargy and restlessness, because lethargy and restlessness are exclusively defiled by nature. Skepticism (vicikitsā) should be understood to belong to the desire [realm] following the precedent of the prior four."