Fathers

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What the Fathers say

Matthew 5:34

Eastern Fathers

John Chrysostom

Next, to lead them farther away from swearing by God, He saith, "Neither by Heaven, for it is God's throne, nor by the earth, for it is the footstool of His feet; nor by Jerusalem, for it is the city of the great King:" still speaking out of the prophetical writings, and signifying Himself not to be opposed to the ancients. This was because they had a custom of swearing by these objects, and He intimates this custom near the end of His Gospel. …

Homily on the Gospel of Matthew 17 ↗

Theophylact of Ohrid

But I say unto, Swear not at all; neither by heaven, for it is God's throne; nor by the earth, for it is the footstool of His feet; neither by Jerusalem, for it is the city of the great king. Since the Jews had heard God say, "Heaven is My throne, and earth is My footstool" (Is. 66:1) they would swear by such things. …

Commentary on Matthew ↗

Western Saints

Augustine of Hippo

But what we could not understand by mere words, from the conduct of the saints we may gather in what sense should be understood what might easily be drawn the contrary way, unless explained by example. The Apostle has used oaths in his Epistles, and by this shows us how that ought to be taken, I say unto you, Swear not at all, namely, lest by allowing ourselves to swear at all we come to readiness in swearing, from readiness we come to a habit of swearing, and from a habit of swearing we fall into perjury. …

Catena Aurea by Aquinas ↗

Jerome

But I say to you, do not swear at all: neither by heaven, for it is the throne of God; nor by the earth, for it is his footstool; nor by Jerusalem, for it is the city of the great King. Nor should you swear by your head, because you cannot make a single hair white or black. The Jews have always had this wicked habit of swearing by the elements, as the prophetic word often accuses them (Isaiah 65). Whoever swears, worships, or loves the one by whom they swear. …

Commentary on Matthew ↗

Bonaventure

The Manichaeans assail us and say that we ought not to swear at all, because it is said in the New Testament, namely in Matthew: "You shall not swear falsely;" and it follows: "But I say to you, not to swear at all. But let your speech be: yes yes, no no." I certainly say that in certain cases or for certain reasons it is quite lawful to swear. But the heretics do not rightly attend to the force of the words. …

Collationes de Decem Praeceptis, Collation 3 ↗