瑜伽論記 15.433

15.433

九、問答辨色界猶有鼻舌兩界，則有二因：一、為嚴身；二、於此二仍未離欲。準藏論更有一因，謂起言說。

Ninth, through questions and answers it clarifies that the form realm still possesses both the nose and tongue elements due to two causes: first, to adorn the body; second, because one has not yet become free from attachment to these two. According to the Kośa treatise there is still another cause, which is to produce speech.