注大乘入楞伽經 7.18

7.18

言帝釋福智俱勝，猶被世論弟子現畜生形，以文詞惑亂，而況於人。是故不應親近者，以彼世論能為生死苦因故。

This says that Indra, though supreme in both merit and wisdom, was still deluded and confused with literary phrasings by a disciple of worldly treatises who manifested in animal form; how much more so ordinary humans! That one "therefore should not associate with them" is because those worldly treatises can be the cause for the suffering of birth and death.