[866] And what, bhikkhus, is the faculty of energy (vīriyindriya)? Here, bhikkhus, a noble disciple (ariyasāvaka) dwells with energy aroused for the abandoning of unwholesome dhammas and for the acquisition of wholesome dhammas; he is strong, firm in exertion, not shirking the burden with regard to wholesome dhammas. He generates desire (chanda), strives, arouses energy, exerts his mind (citta), and endeavours for the non-arising of evil, unwholesome dhammas that have not yet arisen. He generates desire, strives, arouses energy, exerts his mind, and endeavours for the abandoning of evil, unwholesome dhammas that have arisen. He generates desire, strives, arouses energy, exerts his mind, and endeavours for the arising of wholesome dhammas that have not yet arisen. He generates desire, strives, arouses energy, exerts his mind, and endeavours for the attainment of wholesome dhammas that have arisen, for their non-forgetting, for their further growth, for their abundance, for their development, and for their fulfilment. This, bhikkhus, is called the faculty of energy.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.