Quote from A Course in Miracles Text Chapter 4 - THE ILLUSIONS OF THE EGO.

T-4.I.10. The ego is afraid of the spirit's joy, because once you have experienced it you will withdraw all protection from the ego, and become totally without investment in fear. 2 Your investment is great now because fear is a witness to the separation, and your ego rejoices when you witness to it. 3 Leave it behind! 4 Do not listen to it and do not preserve it. 5 Listen only to God, Who is as incapable of deception as is the spirit He created. 6 Release yourself and release others. 7 Do not present a false and unworthy picture of yourself to others, and do not accept such a picture of them yourself.