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Roman Catechism
An Objection Against Oaths
Nor does this doctrine at all clash with these words of the Redeemer, recorded in St. Matthew: You have heard that it was said to them of old: “Thou shalt not foreswear thyself, but thou shalt perform thy oaths to the Lord"; but I say to you not to swear at all; neither by heaven, for it is the throne of God; neither by the earth, for it is his footstool; nor by Jerusalem, for it is the city of the great king; neither shalt thou swear by thy head, because thou canst not make one hair white or black. But let your speech be “yea, yea"; “no, no"; and that which is over and above these is of evil.
It cannot be asserted that these words condemn oaths universally and under all circumstances, since we have already seen that the Apostles and our Lord Himself made frequent use of them. The object of our Lord was rather to reprove the perverse opinion of the Jews, who had persuaded themselves that the only thing to be avoided in an oath was a lie. Hence in matters the most trivial and unimportant they did not hesitate to make frequent use of oaths, and to exact them from others. This practice the Redeemer condemns and reprobates, and teaches that an oath is never to be taken unless necessity require it. For oaths have been instituted on account of human frailty. They are really the outcome of evil, being a sign either of the inconstancy of him who takes them, or of the obstinacy of him who refuses to believe without them. However, an oath can be justified by necessity.
When our Lord says: Let your speech be “yea, yea"; “no, no,” He evidently forbids the habit of swearing in familiar conversation and on trivial matters. He therefore admonishes us particularly against being too ready and willing to swear; and this should be carefully explained and impressed on the minds of the faithful. That countless evils grow out of the unrestrained habit of swearing is proved by the evidence of Scripture, and the testimony of the most holy Fathers. Thus we read in Ecclesiasticus: Let not thy mouth be accustomed to swearing, for in it there are many falls; and again: A man that sweareth much shall be filled with iniquity, and a scourge shall not depart from his house. In the works of St. Basil and St. Augustine against lying, much more can be found on this subject.