22 Let us not moralize on these things here only. For this temporary admonition does not suffice to extirpate the whole evil; but at home also, let the husband hear of these things from the wife, and the wife from the husband. And let there be a kind of rivalry among all in endeavouring to gain precedence in the fulfilment of this law; and let him who is in advance, and has amended his conduct, reproach him who is still loitering behind; to the end that he may stir him up the more by these gibes.
He who is deficient, and has not yet amended his conduct, let him look at him who has outstripped him, and strive with emulation to come up with him quickly. If we take advice on these points, and are anxiously concerned about them, our other affairs will speedily be well adjusted. Be thou solicitous about God's business, and he will take care of yours! And do not say to me, “What if any one should impose upon us the necessity of taking oaths? What if he should not believe us?”
For assuredly, where a law is transgressed, it is improper to make mention of necessity; forasmuch as there is but one necessity which cannot be dispensed with, viz. that of not offending God! This, however, I say further; cut off in the meantime superfluous oaths, those that are taken uselessly, and without any necessity; those to your own family, those to your friends, those to your servants; and should you take away these, you will have no further need of me for the others.
For the very mouth that has been well disciplined to dread and to avoid the frequent oath, should any one constrain it a thousand times, would never consent to relapse again into the same habit. On the contrary, as now, with much labor and vast importunity, by alarming, threatening, exhorting, and counselling, we have scarcely been able to bring it over to a different habit, so in that case, although any one were to impose ever so great necessity, he could not possibly persuade to a transgression of this law. And as a person would never choose to take a particular poison, however urgent the necessity might be, so neither would he to utter an oath!
Source: Homilies on the Statues (New Advent)