Sri Aurobindo
Letters of Sri Aurobindo
Volume IV - Part 2
The only way to get rid of these vital movements is to do 
persistently what he describes himself as doing with the invading forces – i.e. he must be always vigilant, try always at every moment to be conscious, always reject these things, refusing to take pleasure in them, call on the Mother, bring down the descent of the Light. If they return persistently he must not be discouraged; it is not possible to change the nature at once, it takes a long time. If, however, he can keep the psychic consciousness in the front, then it will be much easier and there will be much less difficulty and trouble in the change. That can be done by constant aspiration and abhyāsa.