“"Then those people are right who say that Heaven and Hell are only states of mind?"
"Hush," he said sternly. "Do not blaspheme. 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."”

“The mind is its own place, and in itself / Can make a Heaven of Hell, a Hell of Heaven. / What matter where, if I be still the same…”

“Mind can make a hell of heaven. Or a heaven of hell.”

“The mind is a universe and can make a heaven of hell, a hell of heaven.”

“Heaven is a state of mind, not a location.”

“…the Kingdom of Heaven is not a place, but a state of mind.”

“To different minds, the same world is a hell, and a heaven.”

“Hell is not a place, it's a state of mind and body; hell is obsession with a voice, a face, a name.”

“The world and the mind are states of being. The supreme is not a state. It pervades all states, but it is not a state of something else. It is entirely uncaused, independent, complete in itself, beyond time and space, mind and matter. (…) it leaves no traces. There is nothing to recognize it by. It must be seen directly, by giving up all search for signs and approaches. When all names and forms have been given up, the real is with you. You need not seek it. Plurality and diversity are the play of the mind only. Reality is one.”

“Love in your mind produces love in your life. This is the meaning of heaven.
Fear in your mind produces fear in your life. This is the meaning of hell.”