Quote from A Course in Miracles Text Chapter 13 - THE GUILTLESS WORLD.

T-13.IX.7. Guilt makes you blind, for while you see one spot of guilt within you, you will not see the light. 2 And by projecting it the world seems dark, and shrouded in your guilt. 3 You throw a dark veil over it, and cannot see it because you cannot look within. 4 You are afraid of what you would see there, but it is not there. 5 The thing you fear is gone. 6 If you would look within you would see only the Atonement, shining in quiet and in peace upon the altar to your Father.