cittasya of the thinking faculty, of the conscious faculty
svarupa own form, natural form
anukarah imitation, following
iva as if, as it were
pratyaharah retreat, restrain, withdrawal of the senses
Commentary from Light on the Yoga Sutras by B.K.S. Iyengar
Withdrawing the senses, mind and consciousness from contact with the external objects, and then drawing them inwards towards the seer, is pratyahara.
Now the mind is able to concentrate and the senses no longer importune the mind for their gratification. They lose interest in the tastes and flavors of their respective objects, and are drawn back from the external world in order to help the mind in its inner quest. This is pratyahara.
This is the foundation of the path of renunciation. As a bird cannot fly if one of its wings is cut off, so is it in the case of the sadhaka (one who practices). The two wings of yoga are practice (from Yama to Pranayama) and renunciation (from Pratyahara to Samadhi). For flight, both are necessary. Then the yogi dwells in his soul, perceiving all things directly, without the intervention of citta, the conscious faculty.
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