Augustine of Hippo, on Matt 7:6

“Give not that which is holy to dogs; neither cast ye your pearls before swine, lest perhaps they trample them under their feet, and turning upon you, they tear you.”

“(ubi sup.) 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. He either 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. (John 16:12.) But if any is unable to receive these things because of his filthiness, we must first cleanse him as far 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 perish in 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.”

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