Sri Aurobindo
Letters of Sri Aurobindo
Volume I - Part 4
In the ordinary life, people accept the vital movements, anger, desire, greed, sex etc. as natural, allowable and legitimate things, part of the human nature. Only so far as society discourages them or wishes to keep them within fixed limits or subject to a decent restraint or measure, people try to control them so as to conform to the social standard of morality or rule of conduct. Here on the contrary as in all spiritual life, the conquest and complete mastery of these things is demanded. That is why the struggle is more felt, not because these things rise more strongly in sadhaks than in ordinary men, but because of the intensity of the struggle between the spiritual mind which demands control and the vital movements which rebel and wish to continue in the new as they did in the old life. As for the idea that the sadhana raises up things of the kind, the only truth in that is this that, 
first, there are many things in the ordinary man of which he is not conscious because the vital hides them from the mind and gratifies them without the mind realising what is the force that is moving the action – thus things that are done under the plea of altruism, philanthropy, service etc. are largely moved by ego which hides itself behind these justifications; in Yoga the secret motive has to be pulled out from behind the veil, exposed and got rid of. Secondly, some things are suppressed in the ordinary life and remain lying in the nature, suppressed but not eliminated; they may rise up any day or they may express themselves in nervous forms or other disorders of the mind or vital or body without it being evident what is their real cause. This has been recently discovered by European psychologists and much emphasised, even exaggerated in a new science called psychoanalysis. Here again in sadhana one has to become conscious of these suppressed impulses and eliminate them – this may be called raising up, but that does not mean that they have to be raised up into action but only raised up before the consciousness so as to be cleared out of the being.
As for some men being able to control themselves and others being swept away, that is due to difference of temperament. Some men are sattwic and control comes easy to them, up to a certain point at least; others are more rajasic and find control difficult and often impossible. Some have a strong mind and mental will and others are vital men in whom the vital passions are stronger or more on the surface. Some do not think control necessary and let themselves go. In sadhana the mental or moral control has to be replaced by the spiritual mastery – for the mental control is only partial and it controls but does not liberate; it is only the psychic and spiritual that can do that. That is the main difference in this respect between the ordinary and the spiritual life.