Matthew 13:9

Who has ears to hear, let him hear.
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Augustine of Hippo

AD 430
De Cons. Ev., ii, 41: By the words, “The same day,” he sufficiently shows that these things either followed immediately upon what had gone before, or that many things could not have intervened; unless indeed ‘day’ here after the Scripture manner signifies a period.

George Leo Haydock

AD 1849
He that hath ears to hear. By these words, we are exhorted to examine the meaning of the parables. (St. Jerome) See Chap. xi. 15. We are also taught that not all, but only such as have had the sense of the Scriptures opened to their understanding from above, can properly understand them. The apostles themselves were in ignorance till Jesus Christ gave them the true meaning: aperuit illis sensum, ut intelligerent Scripturas: "he opened their understanding, that they might understand the Scriptures. "(St. Luke xxiv. 45.) It is God who speaketh in the Scripture, and it is God who giveth us to understand what is therein delivered. His truths he conceals from the proud, while he reveals them to the little and humble. How can any persons pretend that the most mysterious, as well as the most sacred book in the world, is open to every understanding? St. Paul (Acts xiii. 26.) tells the Jews, that although the Scriptures were read to them every sabbath-day, their very rulers did not understand ...

Hilary of Poitiers

AD 368
There is moreover a reason in the subject of His discourse why the Lord should sit in the ship, and the multitude stand on the shore. For He was about to speak in parables, and by this action signifies that they who were without the Church could have no understanding of the Divine Word. The ship offers a type of the Church, within which the word of life is placed, and is preached to those without, and who as being barren sand cannot understand it.

Jerome

AD 420
For it must be considered, that the multitude could not enter into the house to Jesus, nor be there where the Apostles heard mysteries; therefore the Lord in mercy to them departed out of the house, and sat near the sea of this world, that great numbers might be gathered to Him, and that they might hear on thesea shore what they were not worthy to hear within; “And great multitudes were gathered unto him, so that he went into a ship, and sat down, and all the people stood on the shore.”. And it is to be noted, that He spake not all things to them in parables, but "many things,” for had He spoken all things in parables, the people would have departed without benefit. He mingles things plain with things dark, that by those things which they understand they may be incited to get knowledge of the things they understand not. The multitude also is not of one opinion, but of divers wills in divers matters, whence He speaks to them in many parables, that each according to their several disposi...

John Chrysostom

AD 407
The Evangelist did not relate this without a purpose, but that he might shewthe Lord’s will therein, who desired so to place the people that He should have none behind Him, but all should be before His face. He had not done thus on the mount; He had not framed His discourse by parables. For there were the multitudes only, and a mixed crowd; but here the Scribes and Pharisees. But He speaks in parables not for this reason only, but to make His sayings plainer, and fix them more fully in the memory, by bringing things before the eyes. He first sets forth a parable to make His hearers more attentive; and because He was about to speak enigmatically, He attracts the attention by this first parable, saying, “Behold, a sower went forth to sow his seed.”. Whence then went out He who is every where present, and how went He out! Not in place; but by His incarnation being brought nearer to us by the garb of the flesh. Forasmuch as we because of our sins could not enter in unto Him, He therefore c...

Rabanus Maurus

AD 856
For not only the Lord’s words and actions, but His journeyings also, and the places in which He works His mighty works and preaches, are full of heavenlysacraments.After the discourse held in the house, wherein with wicked blasphemy He had been said to have a daemon, He went outand taught by the sea, to signify that having left Judaea because of their sinful unbelief, He would pass to the salvation of the Gentiles. For the hearts of the Gentiles, long proud and unbelieving, are rightly likened to the swelling and bitter waves of the sea. And who knows not that Judaea was by faith the house of the Lord. Or, that He went into a ship and sat on the sea, signifies that Christ by faith should enter into the hearts of the Gentiles, and should gather together the Church in the sea, that is in the midst of the nations that spake against Him. And the crowd that stood on the sea shore, neither in the ship nor in the sea, offers a figure of those that receive the word of God, and are by faith sep...

Remigius of Rheims

AD 533
These care to hear, are ears of the mind, to understand namely and do those things which are commanded.

Theophylact of Ochrid

AD 1107
He shows that those who have spiritual ears must understand these things in a spiritual sense. For many have ears but do not use them for hearing. This is why He added, "He who hath ears to hear, let him hear."

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

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