Verse 3

अनन्तस्यात्मतत्त्वस्य सपर्यन्तत्वनिश्चये ।यत्सुखार्थित्वमन्तः स सङ्गो बन्धार्ह उच्यते

In plain words

When there is settled conviction that the infinite truth of the Self is something bounded, the craving for pleasure within -- that saṅga is called fit for bondage.