"Now what is concentration, lady, what qualities are its themes, what qualities are its requisites, and what is its development?"
"Singleness of mind is concentration, friend Visakha; the four frames of reference are its themes; the four right exertions are its requisites; and any cultivation, development, & pursuit of these qualities is its development."
-MN 22
I love the simplicity and eloquence of this answer.
First of all, concentration is simply "singleness of mind." The mind made one. In what way is mind not one? When it seeks pleasure here and there, in this form and in that form, in this feeling and in that feeling, in this perception and in that perception, in this formation and in that formation, in this consciousness and in that consciousness.
Secondly, she states that the themes of concentration are the 4 frames of reference. The 4 frames of reference are detailed in the Anapanasati sutra. Specifically mindfulness of breath in reference to the Body, Feelings, Mind, and Mental Qualities.
Furthermore, the 4 right exertions are its requisites. What are the 4 right exertions (or efforts)?
And what, monks, is right effort? (i) There is the case where a monk generates desire, endeavors, activates persistence, upholds & exerts his intent for the sake of the non-arising of evil, unskillful qualities that have not yet arisen. (ii) He generates desire, endeavors, activates persistence, upholds & exerts his intent for the sake of the abandonment of evil, unskillful qualities that have arisen. (iii) He generates desire, endeavors, activates persistence, upholds & exerts his intent for the sake of the arising of skillful qualities that have not yet arisen. (iv) He generates desire, endeavors, activates persistence, upholds & exerts his intent for the maintenance, non-confusion, increase, plenitude, development, & culmination of skillful qualities that have arisen: This, monks, is called right effort.
SN 45.8
http://www.accesstoinsight.org/tipitaka/sn/sn45/sn45.008.than.html
So before concentration can arise there must have arisen the 4 right exertions. Concentration is dependent upon the 4 right exertions.
Finally, she states that "any cultivation, development, & pursuit of these qualities is its development." So to cultivate, develop, or pursue singleness of mind, the 4 frames of reference, and the 4 right exertions is to cultivate, develop, and pursue Right Concentration.
Beautiful
Comments
For information regarding the 4 frames of refence, please read:
http://www.accesstoinsight.org/tipitaka/mn/mn.118.than.html
and
http://www.accesstoinsight.org/tipitaka/dn/dn.22.0.than.html
These are very important suttas. You should read them both and study their contents.
Still that singleness of mind can be interpreted in many ways.
_/\_