Hell is a state of mind — ye never said a truer word. And every state of mind, left to itself, every shutting up of the creature within the dungeon of its own mind — is, in the end, Hell. But Heaven is not a state of mind. Heaven is reality itself. All that is fully real is Heavenly. For all that can be shaken will be shaken and only the unshakeable remains.

C. S. Lewis (1898 – 1963)