If, however, he dwells upon his spiritual development and changes of mood, his sins and faults all the time and with all his mind, he is likely to overbalance himself. An extravagant preoccupation with his own ego would then result. This would not be true progress. A wise spiritual director, if he has one, could do no better than thoroughly shake him and tell him to go out and get some social enjoyment or see some funny plays, where he can forget himself and lose this unhealthy obsession with his self-centered thoughts and morbid emotions.
-- Notebooks Category 2: Overview of Practicies Involved > Chapter 2: The Measure of Progress > # 46