Quote from A Course in Miracles Text Chapter 16 - THE FORGIVENESS OF ILLUSIONS.

T-16.V.15. The core of the separation illusion lies simply in the fantasy of destruction of love's meaning. 2 And unless love's meaning is restored to you, you cannot know yourself who share its meaning. 3 Separation is only the decision not to know yourself. 4 This whole thought system is a carefully contrived learning experience, designed to lead away from truth and into fantasy. 5 Yet for every learning that would hurt you, God offers you correction and complete escape from all its consequences.