त्रिगुणात्माशेषलोकमालिकासूत्रमस्म्यहम् ।इति निश्चयमेवात्र ह्युपवीतं परं मतम् ॥ १६ ॥
In plain words
"I am the thread on which the garland of all the worlds is strung — worlds whose whole substance is the three guṇas, the three strands." That certainty, just that, is here taken as the sacred thread, and the highest one.
Close to the Sanskrit
"I am the thread of the garland of all the worlds, which have the three guṇas for their nature" — this very conviction, indeed, is here held to be the supreme sacred thread.