Fitness of the mind for concentrations
Furthermore, simply from the practice of prāṇāyāma (comes fitness for concentrations). For it was said: ‘Or by expulsion and retention of prāṇa.’
And there is something else from prāṇāyāma practice: Simply from the practice of prāṇāyāma comes fitness of the mind for concentrations which are to be explained. As has been said (sūtra I.34): ‘By expulsion and retention of prāṇa’ – from these two, steadiness of the mind is attained.
Now what is dissociation?