Changes

The mind is a thing that dwells in diffusion, in succession; it can only concentrate on one thing at a time and when not concentrated runs from one thing to another very much at random. Therefore it has to concentrate on a single idea, a single subject of meditation, a single object of contemplation, a single object of will in order to possess or master it, and this it must do to at least the temporary exclusion of all others. <ref>http://incarnateword.in/cwsa/23/concentration#p7</ref>

The faculty of concentrated attention can be developed scientifically by a methodical training the same way as an athlete develops methodically his muscles. The power of concentration can be developed in such a way that concentration is obtained at will and on whatever subject or activity is chosen. <ref>http://incarnateword.in/cwm/12/concentration-and-dispersion#p5 </ref>