Quote from A Course in Miracles Text Chapter 22 - SALVATION AND THE HOLY RELATIONSHIP.

T-22.III.2. The ego's whole continuance depends on its belief you cannot learn this course. 2 Share this belief, and reason will be unable to see your errors and make way for their correction. 3 For reason sees through errors, telling you what you thought was real is not. 4 Reason can see the difference between sin and mistakes, because it wants correction. 5 Therefore, it tells you what you thought was uncorrectable can be corrected, and thus it must have been an error. 6 The ego's opposition to correction leads to its fixed belief in sin and disregard of errors. 7 It looks on nothing that can be corrected. 8 Thus does the ego damn, and reason save.