諸經要集 2.62

2.62

Furthermore, the Shan gongjing jing says: 'The Buddha said: "If there is a bhikṣu who, though he has many vassa, cannot thoroughly understand such Dharma phrases, he too should take dependence under another. Why is this? When he himself does not yet understand, how much less could he act as a preceptor for dependence to another? Even if he is an elder bhikṣu of a hundred vassa, yet cannot understand the esoteric matters of a śramaṇa and does not understand the vinaya and so forth, he too should be told to take dependence."'