Bad association

"I want to explain that dusanga, bad association, is very dangerous for any devotee. So many varieties of doubts will come in that bad association – doubts about devotees, about bhakti, and about Krsna and Mahaprabhu. They are bound to come if you are not in good association. Gradually you will go very far, far, far away from bhakti, and you will be ruined. I want to caution you about this."

Srila Bhaktivedanta Narayana Goswami Maharaja