Yoga Sūtra Chapter Two verse 53
धारणासु च योग्यता मनसः ॥५३॥
dhāraṇāsu ca yogyatā manasaḥ ||53||
And fitness of the mind for concentration.
dhāraṇā - retaining, keeping back; collection or concentration of the mind; to exercise concentration; the act of holding, bearing, wearing, supporting, maintaining;ca - andyogyatā - fitness, ability, capability, suitableness, proprietymanas - mind; that which objects of sense affect; the faculty or instrument through which thoughts enterCommentaries and Reflections
Commentary by Paul Harvey:
“As Prāṇāyāma dissolves the covering of the light,
fitness of the mind for concentration arises.”