“Mental activities are called Kliṣṭa when they result
in Duḥkha and Akliṣṭa when they do not.
When the three Guṇa are dominant,
Jīva is troubled and mental activities result in Duḥkha.
When the mind is free from desires, inclined toward discrimination
and seeking truth, mental activities do not result in Duḥkha.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 5

“The first type of Pramāṇa, Pratyakṣa, arises from the continuous active link,
through the mind and senses, between Jīva and the object it perceives.
The second type, Anumāna, is when present perception is
based on what has been seen in other situations in the past.
For instance, when I see dark clouds, I think that it may rain.
With the third type, Āgamā, undistorted words from
a reliable source are the basis for perception.
The Veda are Pramāṇa by virtue of their source.
The sage Āpastamba proclaimed that the Veda are Pramāṇa for Dharma.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 7

“When this relationship becomes strong through repeated encounters,
a unique power develops in the mind which is linked to Jīva.
This power is Saṃskāra and from it arises memory or that aspect of understanding
where objects can be comprehended without being physically present.
Based on previous experiences of objects, Saṃskāra gives rise to understanding
and in order for this to happen, Jīva must be linked to the mind.
This ability to remember, known as Asaṃpramoṣa, stays with us for a very long time.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 11

“In order to discipline the mind,
we need to develop a mental practice
that clearly reveals the distinction
between the nature of Jīva and Prakṛti.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 12

“Abhyāsa is the practice of reflecting on the difference
between the nature of Jīva and the nature of Prakṛti,
which brings momentary tranquillity to the mind and
eventually leads to complete and sustained mental tranquillity.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 13

“When Jīva, attached to Prakṛti,
realizes its own true nature with
clear understanding, all desires,
arising from the three Guṇa and
their variations cease entirely.
This state of Vairāgya,
free from all types of desire,
is called Para Vairāgya.”
– T Krishnamacharya on  Yoga Sūtra Chapter One verse 16

“In the second and third Sūtra the means to realise Samādhi
and the true nature of Jīva were explained.
The term used in those Sūtra is Draṣṭṛ
– that which perceives and aids in perception.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 23

“It is through Praṇavo Japam that
the true nature of the Jīva is realised.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 29

“Serious practitioners of Yoga from Vedic times to the present day
emphasise that a clear mind is a prerequisite for Bhakti and
that it is only through Bhakti that the true nature of the Jīva is revealed.
Bhakti, singe minded and abiding, is the mark of a certain unique relationship
characterised by unshakeable faith, absolute trust and boundless devotion.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 30

“Union of Jīva Ātman and Parama Ātman is a Siddhi not a Sādhana when it is felt or realised.
If this is clear then Rāja Yoga is a Siddhi.
However one has to work for it in Sādhana.
Anything that takes you in this direction is a Sādhana.”
– TKV Desikachar France 1983