It is as hard for the ego to judge itself fairly, to look at its actions with a correct perspective as for a man to lift himself by his own braces. It simply cannot do it; its capacity to find excuses for itself is unlimited--even the excuse of righteousness, even the excuse of the quest of truth. All that the aspirant can hope to do is to thin down the volume of the ego's operations and to weaken the strength of the ego itself; but to get rid of the ego entirely is something beyond his own capacity. Consequently, an outside power must be called in. There is only one such power available to him, although it may manifest itself in two different ways, and that is the power of Grace. Those ways are: either direct help by his own higher Self or personal help from a higher man, that is, an illumined teacher. He may call for the first at any time, but he may not rightly call for the second before he has done enough work on himself and made enough advance to justify it.
-- Notebooks Category 8: The Ego > Chapter 5 : Detaching from The Ego (Part 2) > # 424
-- Perspectives > Chapter 8: The Ego > # 38