Matt. xviii. 12; Luke xv. 4.  Ambrose, Expos. in Luc. VII. 210:  “Rich is that shepherd of whose flock we are but the one hundredth part.  Of Angels and Archangels, of Dominions, Powers, Thrones, and others He hath countless flocks, whom He hath left upon the mountains.”  Cf. Gregor, Nyss. Contra Eunom. Or. xii.