[512] And how does a bhikkhu develop the basis of success (iddhipāda) endowed with concentration due to mind and volitional formations of striving (cittasamādhi-padhānasaṅkhāra)?
If a bhikkhu, having made mind (citta) the dominant factor, gains concentration (samādhi), gains one-pointedness of mind — this is called concentration due to mind (cittasamādhi).
For the non-arising of unarisen evil, unwholesome phenomena (dhammā), he generates zeal, endeavors, arouses energy (vīriya), exerts the mind, and strives; for the abandoning of arisen evil, unwholesome phenomena …; for the arising of unarisen wholesome phenomena …; for the persistence, non-loss, increase, abundance, development, and fulfillment of arisen wholesome phenomena, he generates zeal, endeavors, arouses energy, exerts the mind, and strives. These are called volitional formations of striving (padhānasaṅkhārā).
Thus, this concentration due to mind and these volitional formations of striving, gathered together and combined as one, come to be reckoned simply as "concentration due to mind and volitional formations of striving."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.