Sri Aurobindo
Letters of Sri Aurobindo
3. The Mother and the Practice of the Integral Yoga
However hard the fight, the only thing is to fight it out now and here to the end.
The trouble is that you have never fully faced and conquered the real obstacle. There is in a very fundamental part of your nature a strong formation of ego-individuality which has 
mixed in your spiritual aspiration a clinging element of pride and spiritual ambition. This formation has never consented to be broken up in order to give place to something more true and divine. Therefore, when the Mother has put her force upon you or when you yourself have pulled the force upon you, this in you has always prevented it from doing its work in its own way. It has begun itself building according to the ideas of the mind or some demand of the ego, trying to make its own creation in its “own way”, by its own strength, its own sadhana, its own tapasya. There has never been here any real surrender, any giving up of yourself freely and simply into the hands of the Divine Mother. And yet that is the only way to succeed in the supramental Yoga. To be a Yogi, a Sannyasi, a Tapaswi is not the object here. The object is transformation, and the transformation can only be done by a force infinitely greater than your own; it can only be done by being truly like a child in the hands of the Divine Mother.
7 June 1928