Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 2
In the beginning for a long time concentration is necessary even by effort because the nature, the consciousness are not ready. Even then the more quiet and natural the concentration, the better. But when the consciousness and nature are ready, then concentration must become spontaneous and easily possible without effort at all times. Even at last it becomes the natural and permanent condition of the being – it is then no longer concentration, but the settled poise of the soul in the Divine.
It is true that to be concentrated and do an outward action at the same time is not at first possible. But that too becomes possible. Either the consciousness divides into two parts, one the inner poised in the Divine, the other the outer doing the outer work – or else the whole is so poised and the force does the work through the passive instrument.