Give not that which is holy unto the dogs, neither cast your pearls before swine, lest they trample them under their feet, and turn again and tear you.
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Augustine of Hippo
AD 430
Because the simplicity to which He had been directing in the foregoing precepts might lead some wrongly to conclude that it was equally wrong to hide the truthas to utter what was false, He well adds, “Give not that which is holy to the dogs, and cast not your pearls before swine.”.
Serm. in Mont., ii, 20: Let us see now what is the holy thing, what are the dogs, what the pearls, what the swine? The holy thing is all that it were impiety to corrupt; a sin which may be committed by the will, though the thing itself be undone. The pearls are all spiritual things that are to be highly esteemed. Thus though one and the same thing may be called both the holy thing and a pearl, yet it is called holy because it is not to be corrupted; and called a pearl because it is not be contemned.
The dogs are those that assault the truth; the swine we may not unsuitably take for those that despise the truth. Therefore because dogs leap forth to rend in pieces, and what they rend, suffer not to continue whole, He said, “Give not that which is holy to the dogs;” because they strive to the utmost of their power to destroy the truth. The swine though they do not assault by biting as dogs, yet do they defile by trampling upon, and therefore He said, “Cast not your pearls before swine.”.
That which is despised is said to be trodden under foot: hence it is said, "Lest perchance they tread them under foot.”.
That which follows, “Turn again and rend you,” He means not the pearls themselves, for these they tread under foot, and when they turn again that they may hear something further, then they rend him by whom the pearls on which they had trode had been cast. For you will not easily find what will please him who has despised things god by great toil. Whoever then undertake to teach such, Isee not how they shall not be trode upon and rent by those they teach.
We must be careful therefore not to explain ought to him who does not receive it; for men the rather seek that which is hidden than that which is opened. Heeither attacks from ferocity as a dog, or overlooks from stupidity as swine. But it does not follow that if the truth be kept hid, falsehood is uttered. The Lord Himself who never spoke falsely, yet sometimes concealed the truth, as in that, “I have yet many things to say unto you, the which ye are not now able to bear.” But if any is unable to receive these things because of his filthiness, we must first cleanse him asfar as lays in our power either by word or deed. But in that the Lord is found to have said some things which many who heard Him did not receive, but either rejected or contemned them, we are not to think that therein He gave the holy thing to the dogs, or cast His pearls before swine. He gave to those who were able to receive, and who were in the company, whom it was not fit should be neglected for the uncleanness of the rest. And though those who tempted Him might perishin those answers which He gave to them, yet those who could receive them by occasion of these inquiries heard many useful things. He therefore who knows what should be answered ought to make answer, for their sakes at least who might fall into despair should they think that the question proposed is one that cannot be answered. But this only in the case of such matters as pertain to instruction of salvation; of things superfluous or harmful nothing should be said; but it should then be explained for what reason we ought not to make answer in such points to the enquirer.
