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dhāraṇāsu ca yogyatā manasaḥ

धारणासु च योग्यता मनसः

And fitness of the mind for concentration

dhāraṇā - concentration

ca - and

yogyatā - fitness, ability, capability, suitableness, propriety

manas - mind

Commentary by Paul Harvey:

“As Prāṇāyāma dissolves the covering of the light, fitness of the mind for concentration arises.”

“Prāṇāyāma is a key to the door of Dhāraṇā.”