5 Why should any one describe the silly chatter of our own people? For these are not less than the attacks upon us from without, while they give the teacher even more trouble. Some out of an idle curiosity are rashly bent upon busying themselves about matters which are neither possible for them to know, nor of any advantage to them if they could know them. Others again demand from God an account of his judgments, and force themselves to sound the depth of that abyss which is unfathomable.
“For your judgments,” says the Scriptures, “are a great deep,” and about their faith and practice you would find few of them anxious, but the majority curiously inquiring into matters which it is not possible to discover, and the mere inquiry into which provokes God. For when we make a determined effort to learn what He does not wish us to know, we fail to succeed (for how should we succeed against the will of God?); and there only remains for us the danger arising from our inquiry.
Now, though this be the case, whenever any one authoritatively stops the search, into such fathomless depths, he gets himself the reputation of being proud and ignorant; so that at such times much tact is needed on the Bishop's part, so as to lead his people away from these unprofitable questions, and himself escape the above-named censures. In short, to meet all these difficulties, there is no help given but that of speech, and if any be destitute of this power, the souls of those who are put under his charge (I mean of the weaker and more meddlesome kind) are no better off than ships continually storm-tossed. So that the Priest should do all that in him lies, to gain this means of strength.
Source: On the Priesthood (New Advent)