पातञ्जल योगसूत्र (स्वामी विवेकानन्द भाष्य एवं सूत्र व्याख्या)

Patanjali Yoga Sutras
changing. Mind itself is continuously changing. The mind and
body are like two layers in the same substance, moving at
different rates of speed. Relatively, one being slower and the
other quicker, we can distinguish between the two motions.
For instance, a train is moving, and another carriage is
moving slowly alongside it. It is possible to find the motion of
both these, to a certain extent. But still something else is
necessary. Motion can only be perceived when there is
something else which is not moving. But when two or three
things are relatively moving, we first perceive the motion of
the faster one, and then that of the slower ones. How is the
mind to perceive? It is also in a flux. Therefore another thing
is necessary which moves more slowly, then you must get to
something in which the motion is still slower, and so on, and
you will find no end. Therefore logic compels you to stop
somewhere. You must complete the series by knowing
something which never changes. Behind this never ending
chain of motion is the Purusa, the changeless, the colourless,
the pure. All these impressions are merely reflected upon it, as
rays of light from a camera are reflected upon a white sheet,
painting hundreds of pictures on it, without in any way
tarnishing the sheet.
18. न तत् स्वाभासंदृश्यत्वात् ॥ १८ ॥
na tat svabhasandrishyatvat
Mind is not self-luminous, being an object.
Tremendous power is manifested everywhere in nature, but
yet something tells us that it is not self-luminous, not
essentially intelligent. The Purusa alone is self-luminous, and
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