“In this Sūtra, Patañjali lists the five types of mental activities:
Pramāṇa Vṛtti, Viparyaya Vṛtti, Vikalpa Vṛtti, Nidrā Vṛtti, and Smṛti Vṛtti.
Vṛtti and Pariṇāma are synonymous, meaning “change of form”.
These five Vṛtti represent changes in the characteristics and functions of the mind.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 6

“Our continued effort
with the breath in Āsana
is that which helps to enliven
our various levels of interaction
with our inner and outer worlds as
expressed through the Pañca Maya.”
– Paul Harvey on Yoga Sūtra Chapter Two verse 47

“The ten senses or Das Indriya are the gateways
between our inner and the outer experiences,
in the twin roads of the worldly phenomena
that we call sensory knowing or bodily action.
The five senses that transport knowing from
the outer to the inner are called the Jñāna Indriya,
or the senses through which we perceive the world.
The five senses that transport action from
the inner to the outer are called the Karma Indriya,
or the senses through which we act out into the world.
The coordinator of this remarkable interface is Manas,
often referred to as the eleventh sense or internal organ.
The identifier in this remarkable process is Ahaṃkāra.
The discerner in this remarkable trinity is Buddhi.
The source of perception within this remarkable play
of knowing and action is known as Cit or Puruṣa.”
– Paul Harvey on Yoga Sūtra Chapter Two verse 54

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