There is nothing outside you. That is what you must ultimately learn, for it is the realization that the Kingdom of Heaven is restored to you. For God created only this, and He did not depart from it nor leave it separate from Himself. The Kingdom of Heaven is the dwelling place of the Son of God, who left not his Father and dwells not apart from Him. Heaven is not a place nor a condition. It is merely an awareness of perfect oneness, and the knowledge that there is nothing else; nothing outside this oneness, and nothing else within.

- Jesus Christ in A Course in Miracles, Chapter 18, VI and Lesson 166