“A person who is physically fit and
who has been cleansed by the Agni of Dhyānam
has no fear of sickness, disease, age or death.”
– T Krishnamacharya on Yoga Sūtra Chapter Three verse 2

“As Prāṇāyāma dissolves the covering of the light,
fitness of the mind for concentration arises.”
– Paul Harvey on  Yoga Sūtra Chapter Two verse 53

“Āsana and Prāṇāyāma can, according to the Yoga Sūtra,
create a condition where the mind is fit for Dhāraṇā.”
– TKV Desikachar Religiousness in Yoga Chapter Eleven Page 156

“Prāṇāyāma is regarded as a Tapas,
a Kriyā, which cleanses the Nāḍī,
It is a Sādhana which sharpens Agni
and helps to dissolve obstacles, thus
making the mind fit for attention.”
– 108 Yoga Practice Pointers

“The principles of Cikitsā, Rakṣaṇa and Śikṣaṇa Krama
are more applicable to the ‘mindset’ of a person,
rather than looking through the ‘fitness’ of their body.”
– 108 Teaching Path Pointers