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In concentration proper there is not a series of thoughts, but the mind is silently fixed on one object, name, idea, place etc.
There are other kinds of concentration, e.g. concentrating the whole consciousness in one place, as between the eyebrows, in the heart, etc. One can also concentrate to get rid of thought altogether and remain in a complete silence.
<ref>Sri Aurobindo. (2015). The Synthetic Method of the Integral Yoga. In Letters on yoga II. Retrieved from http://incarnateword.in/cwsa/29/concentration-and-meditation</ref>
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Concentration is a state one must be in continually, whatever the outer activity.<ref>The Mother. (1979). Letters to a Young Sadhak VI (1933-1949). In Collected works of the Mother Volume 16. Retrieved from http://incarnateword.in/cwm/16/letters-to-a-young-sadhak-vi</ref>
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Concentration is a gathering together of the consciousness and either centralising at one point or turning on a single object, e.g. the Divine—there can also be a gathered condition throughout the whole being, not at a point.
<ref>Sri Aurobindo. (2015). The Synthetic Method of the Integral Yoga. In Letters on yoga II. Retrieved from http://incarnateword.in/cwsa/29/concentration-and-meditation</ref>
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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.
<ref>Sri Aurobindo. sabcl/20/concentration</ref>
=Why should one learn to concentrate?=