Along with purity and as a help to bring it about, concentration. Purity and concentration are indeed two aspects, feminine and masculine, passive and active, of the same status of being; purity is the condition in which concentration becomes entire, rightly effective, omnipotent; by concentration purity does its works and without it would only lead to a state of peaceful quiescence and eternal repose. Their opposites are also closely connected; for we have seen that impurity is a confusion of Dharmas, a lax, mixed and mutually entangled action of the different parts of the being; and this confusion proceeds from an absence of right concentration of its knowledge on its energies in the embodied Soul. The fault of our nature is first an inert subjection to the impacts of things as they come in upon the mind pell-mell without order or control and then a haphazard imperfect concentration managed fitfully, irregularly with a more or less chance emphasis on this or on that object according as they happen to interest, not the higher soul or the judging and discerning intellect, but the restless, leaping, fickle, easily tired, easily distracted lower mind which is the chief enemy of our progress. In such a condition purity, the right working of the functions, the clear, unstained and luminous order of the being is an impossibility; the various workings, given over to the chances of the environment and external influences, must necessarily run into each other and clog, divert, distract, pervert. Equally, without purity the complete, equal, flexible concentration of the being in right thought, right will, right feeling or secure status of spiritual experience is not possible. Therefore the two must proceed together, each helping the victory of the other, until we arrive at that eternal calm from which may proceed some partial image in the human being of the eternal, omnipotent and omniscient activity.
- Sri Aurobindo. sabcl/20/concentration