唯識二十論述記 2.313

2.313

闍提乃云：我令汝取瞿曇作我弟子，彼既不得，今復失汝，我今為汝說一譬喻，遂作喻云：譬如有人須欝婆羅根，取欲食之，令人入池處處求覓，求覓不得，自拔男根，不得欝婆羅根，又自失根，汝亦如是。如是求覓瞿曇不得，反更失汝，汝如男根。

Jñātiputra then said: "I had you bring Gautama to make him my disciple; not only did you not get him, but now I have lost you as well. I shall now tell you a simile." He then made this simile: "Just as a man who needs an utpala root and wants to take it to eat, sends someone into a pond to search everywhere, and when he cannot find it, he pulls off his own male root (penis); failing to get the utpala root, he also loses his own root. You are just like this. Searching for Gautama like this, you did not get him, and on the contrary, I have lost you; you are like that male root."