Verse 66

वासनैवेह भवतां हेतुरेकत्र बन्धने ।रज्जुः शून्याशयप्रोता मुक्तानामातता यथा

In plain words

Vāsanā alone, here, is the cause of your being bound together - just as a string threaded through the empty hollows of pearls, drawn taut, binds them together.