梵網經菩薩戒本疏 5.118

5.118

七、通塞者，若性闇鈍，懃學未成，若不隱無知，若便無人為師，如此所作，一切准應無犯。反上皆犯。

Seventh, regarding permissible and impermissible circumstances: if one's nature is dull and dim and diligent study has not yet borne fruit; or if one does not conceal one's lack of knowledge; or if there is simply no one else to act as a master—actions performed under these circumstances, by analogy, should be entirely free of offense. The opposite of the above constitutes an offense.