There can be no permanent friendship with a bad friend whose attachinent is very uncertain. There is disgrace in a bad connection, when there is no necessity for it.
कुमित्रे संगतिर्नास्ति नित्यमस्थिरसौहदे। अवमानः कुसम्बन्धे भवत्यर्थविपर्यये॥