A man may travel quite a distance on the way towards this goal of self-conquest and then, as success begins to appear on the horizon, may fail and fall from it in the last few tests. His very success may begin to generate vanity, pride, self-importance, ambition, and arrogance. In this way his ego is once more stimulated instead of being subjugated. Thus he steps aside from the path although he has already gone so far along it.
-- Notebooks Category 11: The Negatives > Chapter 2: Their Roots in Ego > # 50