9 Other things too besides these it were to our purpose to enquire into. But I see that the time does not permit us to launch our discourse upon so wide a sea; wherefore prudently reserving these to a fit season, we would again address you on the subject of abstinence from oaths; and we would entreat your Charity to use much diligence respecting this matter. For what is it but an absurdity, that not even a servant dares to call his master by name, nor to mention him unceremoniously, and casually, but that he should everywhere bandy about the name of the Lord of Angels familiarly with much irreverence!
And if it be necessary to take the book of the Gospel, you receive it with hands that have been first washed; and fearfully and tremblingly, with much reverence and devotion; and do you unceremoniously bandy about upon your tongue the Lord of the Gospel? Do you desire to learn how the Powers above pronounce that Name; with what awe, with what terror, with what wonder? “I saw the Lord,” says the prophet, “sitting upon a throne, high, and lifted up; around Him stood the Seraphim; and one cried unto another, and said, Holy, Holy, Holy, Lord God of Sabaoth; the whole earth is full of His glory!” Perceivest thou, with what dread, with what awe, they pronounce that Name, while glorifying and praising Him?
But you, in your prayers and supplications, callest upon Him with much listlessness; when it would become you to be full of awe, and to be watchful and sober! But in oaths, where it is wholly unsuitable that this wonderful Name should be introduced, there you make a long string of various forms of imprecation! What pardon then, or what excuse shall we have, howsoever we may plead this “custom”? It is said, that a certain heathen orator, by a kind of foolish habit, was continually moving his right shoulder as he went along. He conquered this habit, however, by fastening sharp knives on each side over his shoulders, so that the fear of being cut controlled the member in its unseasonable movement by fear of the wound!
Do thou too, then, act thus with regard to your tongue, and instead of the knife, suspend over it the fear of God's chastisement, and you will assuredly get the better! For it seems impossible, utterly impossible, that those should ever be overcome, who are solicitous and earnest about this, and really make it their business.
Source: Homilies on the Statues (New Advent)