Liangjie of Dongshan (807-869)
The first is defiled views. This is not departing from a particular fixed view about the nature of Awakening and thus falling into a sea of poison.
The second is defiled emotions. This is entrapment in preferences and repulsions, thus having one's perspective become one-sided and rigid.
The third is defiled language. This is mastering trivia and losing sight of the essential. The potential for Awakening is thoroughly obscured.