首楞嚴義疏注經 9.333

9.333

若行住在定，遊禮何妨。若蕩逸周流，隨情喪志。魔得其便，恣欲其心，破佛律儀，廣行魔業。二、口說異端去身留難。

If walking or staying in concentration, what harm is there in traveling and paying homage? But if dissipating and drifting, following feelings and losing determination, the demon finds its opportunity, giving free rein to desires in his mind, breaking the Buddha's moral discipline, and extensively performing demonic deeds. 2. Preaching aberrant doctrines with his mouth, abandoning the body and leaving behind disaster.