पातञ्जल योगसूत्र (स्वामी विवेकानन्द भाष्य एवं सूत्र व्याख्या)

Patanjali Yoga Sutras
CHAPTER I - SAMADHI PADA
CONCENTRATION: ITS SPIRITUAL USES
॥ प्रथमः समाधिपादः ॥

1. अथ योगानुशासनम् ॥ १॥
   atha yoganushasanam
   Now concentration is explained.
2. योगश्चित्तवृत्तिनिरोधः ॥ २॥
   yogashchittavrittinirodhah
   Yoga is restraining the mind-stuff (Chitta) from
   taking various forms (Vrttis)
   A good deal of explanation is necessary here. We have to
   understand what Chitta is, and what are these Vrttis. I have
   this eye. Eyes do not see. Take away the brain centre which is
   in the head, the eyes will still be there, the retinæ complete,
   and also the picture, and yet the eyes will not see. So the eyes
   are only a secondary instrument, not the organ of vision. The
   organ of vision is in the nerve centre of the brain. The two
   eyes will not be sufficient alone. Sometimes a man is asleep
   with his eyes open. The light is there and the picture is there,
   but a third thing is necessary; mind must be joined to the
   organ. The eye is the external instrument, we need also the
   brain centre and the agency of the mind. Carriages roll down a
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