Friends:

How are the 5 Mental Abilities (indriya) being developed?

There are these 5 mental Abilities:
The ability (faculty) of faith,
The ability of energy,
The ability of awareness,
The ability of concentration,
The ability of understanding.

The five abilities are being developed in 10 aspects:
When a Noble Friend is leaving sceptical doubt behind, this is development of the faith ability.
When a Noble Friend is developing the faith ability, then this mist-trust non-faith is left behind.
When a Noble Friend is leaving laziness behind, this is development of the energy ability.
When a Noble Friend is developing the energy ability, this indolent idleness is left behind.
When a Noble Friend is leaving negligence behind, this is development of the awareness ability.
When a Noble Friend is developing the awareness ability, this lax inattentiveness is left behind.
When a Noble Friend is leaving distraction behind, this is development of the concentration ability.
When a Noble Friend is developing the concentration ability, this mental scatter is left behind.
When a Noble Friend is leaving ignorance behind, this is development of the understanding ability.
When a Noble Friend is developing the understanding ability, this blind not knowing is left behind.
The five abilities are being developed in these 10 aspects.

The five abilities have been thus developed, thus fully developed in 10 aspects:
Because sceptical doubt has been fully left, the faith ability has been fully developed.
Because the faith ability has been fully developed, non-faith has been fully left.
Because laziness has been fully left, the energy ability has been fully developed.
Because the energy ability has been fully developed, idleness has been fully left.
Because negligence has been fully left, the awareness ability has been fully developed.
Because the awareness ability has been fully developed, non-attention has been fully left.
Because distraction has been fully left, the concentration ability has been fully developed.
Because the concentration ability has been fully developed, mental scatter has been fully left.
Because ignorance has been fully left, the understanding ability has been fully developed.
Because the understanding ability has been fully developed, ignorance has been fully left.
The five abilities have been developed, quite fully developed in these 10 aspects.

The five abilities have fully tranquillized in four aspects:
At the path-moment of stream-entry, the five abilities are being developed.
At the fruition-moment of stream-entry, they have been fully developed, & fully tranquillized.
At the path-moment once-return, the five abilities are being developed.
At the fruition-moment of non-return, they have been fully developed, & fully tranquillized.
At the path-moment once-return, the five abilities are being developed.
At the fruition-moment of non-return, they have been fully developed, & fully tranquillized.
At the path-moment Arahatship, the five abilities are being developed.
At the fruition-moment of Arahatship, they have been fully developed, & fully tranquillized.
So there are four purifications in the paths, four purifications in the fruitions,
four purifications in the cuttings off, and four purifications in the tranquillizations.
The five abilities have been fully developed & also fully tranquillized, these 4 aspects.   

There is development of the abilities in 8 kinds of persons:
In what eight kind of persons is there development of the abilities?
In the 7 initiators & in the Magnanimous Ordinary Man, is there development of the abilities.
In what three kinds of persons have the abilities been completely developed?
In a Perfect One’s disciple (a hearer) with the mental fermentations all eliminated, who has been
enlightened as a disciple by hearing it from a Teacher, have the abilities been completely developed.
In One who has reached enlightenment without declaring it, (Solitary Buddha) in the sense of being
self-enlightened, without a teacher, have the abilities been completely developed.
In a Perfect One, accomplished & fully enlightened, in the sense of being immeasurable, infinite,
have the abilities been completely developed. There is development of the abilities in these 8 kind
of persons. The 5 mental abilities have been completely developed in these three kinds of persons…

Source: Ven. Sariputta in: The Path of Discrimination: Patidasambhidamagga:
http://www.pariyatti.com/book.cgi?prod_id=133494

For further Study of the 5 Mental Abilities, which become the 5 Powers:
http://What-Buddha-Said.net/drops/III/Five_Abilities_Summary.htm