俱舍論頌疏論本 17.8

17.8

所斷欲生得者，所斷善根唯是欲界生得善也，謂斷善時，色、無色善先不成故，不可說斷。問：「何緣唯斷生得善根？」答：「加行善根先已退故，謂斷善根，先加行位捨加行善，至斷善時，唯斷生得。」

Regarding "what is severed is innately acquired in the desire [realm]," the roots of good that are severed are exclusively the innately acquired good of the desire realm. That is, at the time of severing the roots of good, the good of the form and formless realms was not previously accomplished, so it cannot be said to be severed. Question: "For what reason are only the innately acquired roots of good severed?" Answer: "Because the acquired-through-effort roots of good have already been lost earlier. That is, when severing the roots of good, one first abandons the good acquired through effort in the stage of preparation; when one reaches the point of severing the roots of good, one severs only the innately acquired [good]."