How can the ego's self-effort bring about the grand illumination? It can only clear the way for it, cleanse the vehicle of it, and remove the weaknesses that shut it out. But the light of wisdom is a property of the innermost being--the Soul--and therefore this alone can bring it to a man. How can the ego give or attain something which belongs to the Overself? It cannot. Only the divine can give the divine. That is to say, only by grace can illumination be attained, no matter how ardently he labours for it.
-- Notebooks Category 18: The Reverential Life > Chapter 5: Grace > # 162