This lower part of the being (Disobedience and indiscipline) is always random, wayward, self-assertive and unwilling to accept the imposition on it of any order and discipline other than its own idea or impulse. Its defects even from the beginning stand in the way of the efforts of the higher vital to impose on the nature a truly regenerating tapasya. This habit of disobedience and disregard of discipline is so strong that it does not always need to be deliberate; the response to it seems to be immediate, irresistible and instinctive. Thus obedience to the Mother is repeatedly promised or professed, but the action done or the course followed is frequently the very opposite of the profession or promise. This constant indiscipline is a radical obstacle to the sadhana and the worst possible example to others.
Ref: Letters on Yoga – IV