“Can these four Yoga Aṅga – Yama, Niyama, Āsana, Prāṇāyāma
– be practiced by everyone at every stage of life?
How often and how long should one practice?
How can we adapt our practice to changing circumstances?
These questions and others like them must be answered by a competent teacher,
according to each student’s individual circumstances.”
– T Krishnamacharya’s commentary to Yoga Sūtra Chapter One verse 30

“The practice which is Śodhana for the Antar Aṅga
is Antaraṅga Sādhana.”
– T Krishnamacharya introduction to Yoga Sūtra Chapter Three

Question:
What is the most important aspect of Pūrva Aṅga?
Response:
“Pūrva Aṅga is essentially a process of elimination
in which we eliminate those thoughts that are not relevant.
In fact Yoga is the process of eliminating the undesirable
so we can be linked with the desirable.
It is the movement from Saṃyoga to Viyoga,
from Saguṇa to Nirguṇa.
But we must be careful how we define desirable or undesirable.”
– TKV Desikachar Madras December 19th 1988

“Often Dhyāna fails because one is not able to reach the first stage,
the Pūrva Aṅga.
Often one wants to go to the second stage
without going through the first one,
and that is not possible.”
– TKV Desikachar Madras December 19th 1988

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All models for meditation have a preliminary step, Pūrva Aṅga……