俱舍論疏 12.173

12.173

論「引不極成為能立故」，即論主答非理。我宗不許藤生於支、縷生於衣。既不共許，不是極成。宗為所立，喻為能立，引不共許縷生衣等為能立故。

The treatise says: "Because you cite what is unestablished as a proof." That is, the Master of the Treatise explains what is unreasonable: Our school does not admit that vines arise from stems, or that threads produce cloth. Since this is not mutually admitted, it is not established (asiddha). The thesis is the probandum, and the analogy is the proof; you cite what is not mutually admitted—threads producing cloth and the like—as the proof.