Incredible Wisdom of Bharat!

तत्प्रतिषेधार्थमेकतत्त्वाभ्यासः।

To eliminate these (disturbances) practice on one principle.

It is mandated that one practice on one principle, as a first step till one reaches nirvichara samadhi, the equilibrium state without deliberation. This one principle preferably could be īśvaraḥ for an easy and faster progress. Focusing on nothing or emptiness is not the prescribed method as per Patanjali.

ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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