Augustine of Hippo
Catena Aurea · Lukasevangelium 18
And he spake a parable unto them to this end, that men ought always to pray, and not to faint; Saying, There was in a city a judge, which feared not God, neither regarded man: And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary. And he would not for a while: but afterwards he said within himself, Though I fear not God, nor regard man; Yet because this widow troubleth me, I will avenge her, lest by her continual coming she weary me. And the Lord said, Hear what the unjust judge saith. And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them? I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth? It follows, And there was a widow in that city.
(ut sup.) If then with the most unjust judge, the perseverance of the suppliant at length prevailed even to the fulfilment of her desire, how much more confident ought they to feel who cease not to pray to God, the Fountain of justice and mercy? And so it follows. And the Lord said, Hear what, &c.