पृष्ठशून्यं मूलशून्यं युगपद्भावयेच्च यः ।
शरीरनिरपेक्षिण्या शक्त्या शून्यमना भवेत् ॥३९॥
pṛṣṭhaśūnyaṃ mūlaśūnyaṃ yugapad bhāvayec ca yaḥ |
śarīranirapekṣiṇyā śaktyā śūnyamanā bhavet
anuṣṭubh
Whoever simultaneously contemplates the void at the back and the void at the root — by a Śakti indifferent to the body, one becomes mind-of-void.