Gregory of Nyssa, on Isa 51:2

“Look unto Abraham your father, and to Sara that bore you: for I called him alone, and blessed him, and multiplied him.”

“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.”

Imported from an open dataset — not yet checked against the printed edition.