“No rack can torture me, My soul 's at liberty. Behind this mortal bone There knits a bolder oneYou cannot prick with saw, Nor rend with scymitar. Two bodies therefore be; Bind one, and one will flee.The eagle of his nest No easier divest And gain the sky, Than mayest thou,Except thyself may be Thine enemy; Captivity is consciousness, So's liberty.”

Source: Wikiquote