Quote from A Course in Miracles Text Chapter 11 - GOD OR THE EGO.

T-11.in.1. Either God or the ego is insane. 2 If you will examine the evidence on both sides fairly, you will realize this must be true. 3 Neither God nor the ego proposes a partial thought system. 4 Each is internally consistent, but they are diametrically opposed in all respects so that partial allegiance is impossible. 5 Remember, too, that their results are as different as their foundations, and their fundamentally irreconcilable natures cannot be reconciled by vacillations between them. 6 Nothing alive is fatherless, for life is creation. 7 Therefore, your decision is always an answer to the question, "Who is my father?" 8 And you will be faithful to the father you choose.