“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

“The mutual aim of Yoga and Sāṃkhya is to
experience the more discerning aspects of the psyche,
rather than just the more grasping aspects of the psyche.
In the former, the tendency of the Buddhi to discern discriminately
prevails over the tendency of Ahaṃkāra to grasp indiscriminately.
In the latter, the tendency of the Ahaṃkāra to grasp indiscriminately
prevails over the tendency of the Buddhi to discern discriminately.
The former is a state known as Buddhi Sattva,
where the clarity of discernment prevails over the
indiscriminate grasping nature of the Ahaṃkāra.
The latter is a state of Buddhi Tamas,
where the discerning clarity of the Buddhi
is obscured by the grasping nature of the Ahaṃkāra.
Thus our Yoga Sādhana has but one primary Saṃkalpa,
that of the reduction of the obscuration by Tamas in the Buddhi.
This reduction of Tamas facilitates the advent of the clarity of Sattva,
as in the metaphor of the reduction of the cloud facilitates the advent of the sun.”
– Paul Harvey on Yoga Sūtra Chapter Three verse 49

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