1-12.
The Twelve Discourses Beginning with Strenuous Deeds
673-684.
"Just as, monks, whatever activities requiring strength are done, all of them are done in dependence on earth, established upon earth, thus these activities requiring strength are done;
so too, monks, a monk, based upon morality, established upon morality, develops the four right strivings, cultivates the four right strivings.
And how, monks, does a monk, based upon morality, established upon morality, develop the four right strivings, cultivate the four right strivings?
Here, monks, a monk generates desire for the non-arising of unarisen evil unwholesome mental states, he strives, arouses energy, exerts the mind, and strives, etc.
he generates desire for the presence, non-decay, increase, expansion, development, and fulfilment of arisen wholesome mental states, he strives, arouses energy, exerts the mind, and strives.
Thus, monks, a monk, based upon morality, established upon morality, develops the four right strivings, cultivates the four right strivings."
The twelfth.