You know the known, so go a little into the unknown. The mind that is caught up in the known - extended a little beyond reason. The moment you go beyond , you move in the soul. Releasing the bondage of your mind to extend further, reach the unknown a little more. The further you go, you realize that the known is limited and the unknown is vast.
B.K.S. IyengarThe 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. Iyengar