Gratis.—Ven. Bede, cap. xxviii.
Rule.—"The light which St. Columbanus disseminated, by his knowledge and doctrine, wherever he presented himself, caused a contemporary writer to compare him to the sun in his course from east to west; and he continued after his death to shine forth in numerous disciples whom he had trained in learning and piety."—Benedictine Hist. Litt. de la France.
World.—See Herring's Collectanea and the Bibliotheca Patrum, tom. xii.