俱舍論疏 29.28

29.28

The Śāstra states: "In their preparatory stage... up to: they can counteract the four obstacles." This explains the reason for stating that they suppress and counteract the four obstacles. "The fundamental state of the four immeasurables" refers to the fundamental absorption; in this stage there are no obstacles such as ill-will. Speaking of counteracting the four obstacles applies to the preparatory stage. Or, in the fundamental state they are also called counteracting obstacles because they cause the already severed obstacles to become even further removed.