Gregory of Nyssa : For the divine voice says somewhere in the prophecy of Isaiah, "Consider Abraham, your father, and Sarah, who gave you birth." Scripture gives this admonition to those who wander outside virtue. Just as at sea those who are carried away from the direction of the harbor bring themselves back on a course by a clear sign, on seeing either a beacon light raised up high or some mountain peak coming into view, in the same way Scripture by the example of Abraham and Sarah may guide again to the harbor of the divine will those adrift on the sea of life with a pilotless mind. — LIFE OF MOSES, PROLOGUE 11 Theodoret of Cyrus : He is leaving aside the unbelievers here in order to address those who have believed: it is to them that he gives the name of enamored with God and with righteousness. He comforts them because they are few in number and invites them to turn their eyes toward their ancestors: he reminds them of Abraham and Sarah and the many thousands of descendants who came from them. This is similar to the term expressed in the divine Gospels: "Do not fear, little flock, for it is your Father's good pleasure to give you the kingdom." It is the same here. — COMMENTARY ON Isaiah 16:51.1 Theodoret of Cyrus : Nothing made is an obstacle to my power: not the fact that I called just one man or that old age was on him, or that Sarah lacked the physical capability; yet his race was [indeed] increased, just as I had wished. Be unbelieving no longer, therefore, even though you are [now] easy to count; I will make you too many to number. — COMMENTARY ON Isaiah 16:51.2