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. IyengarAnything physical is always changing, therefore, its reality is not constant, not eternal.
B.K.S. IyengarAs long as the body is not in perfect health, you think about it, and that prevents you from thinking of the mind. The sound mind is a sound body.
B.K.S. Iyengar