The sleeping tortoise takes all its limbs into its carapace. So does the yogi: going back into himself he does not see anything worldly any longer, he makes peace in himself.
B.K.S. IyengarYoga is about the will, working with intelligence and self-reflexive consciousness, can free us from the inevitability of the wavering mind and outwardly directed senses.
B.K.S. Iyengar