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Genesis 24:14

And let it come to pass, that the damsel to whom I shall say, Let down your pitcher, I pray you, that I may drink; and she shall say, Drink, and I will give your camels drink also: let the same be she that you have appointed for your servant Isaac; and thereby shall I know that you have showed kindness unto my master.
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Caesarius of Arles

AD 542
Now, dearly beloved, let us briefly see, as far as we can, what these facts mean. When blessed Abraham directed his servant to take a wife for his son, he portrayed an image of God the Father. Just as when he offered the boy as a holocaust, he then presented an image of God the Father, so also his servant signified the words of prophecy. For this reason Abraham sent his servant into a distant land to take a wife for his son, because God the Father intended to send his prophetic word throughout the world to search for the Catholic church as a spouse for his onlybegotten Son.

George Leo Haydock

AD 1849
By this. He chose a mark which would manifest the kindness and humility of the maid, who would be a fit match for the pious Isaac. This was no vain observation. God heard his fervent prayer. (St. Chrysostom) (Calmet) It is sometimes lawful to ask a sign or miracle of God, (Acts i. 24; iv. 30; 1 Kings xiv,) but we must carefully avoid whatever the Church disapproves. (St. Augustine de Gen. ii. 17; xii. 22.) (Worthington)

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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