PG 31 · cols. 889–1052
Basil the Great, The Longer Rules (Regulae fusius tractatae)
Basil of Caesarea (d. 379): the Longer Rules, fifty-five questions put by his monks and answered at length, from the love of God and neighbour as the root of all the commandments, through renunciation, common life, obedience and work, to the admission and correction of brethren, in Greek, with the editors' notes.
Migne Reading Room