Quote from A Course in Miracles Text Chapter 10 - THE IDOLS OF SICKNESS.

T-10.V.2. Do not forget, however, that to deny God will inevitably result in projection, and you will believe that others and not yourself have done this to you. 2 You must receive the message you give because it is the message you want. 3 You may believe that you judge your brothers by the messages they give you, but you have judged them by the message you give to them. 4 Do not attribute your denial of joy to them, or you cannot see the spark in them that would bring joy to you. 5 It is the denial of the spark that brings depression, for whenever you see your brothers without it, you are denying God.