Second Commandment
The Canterbury TalesThe Second Commandment, expressed as “Thou shalt not take my name in vain,” is presented as a direct prohibition against treating divine language casually, falsely, or without righteous purpose. Its importance extends beyond private devotion: in the world of the tales, speech repeatedly creates obligations, authorizes decisions, seals promises, delivers curses, and exposes the moral character of those who speak. The commandment therefore supplies a standard by which apparently different acts of speech can be measured: whether the speaker has proper authority, whether the words are truthful and necessary, and what consequences follow when sacred language is made an instrument of appetite, fear, power, or deceit.
Definition and Scriptural Authority
The sermon begins by distinguishing the seriousness of swearing from the merely emotional force of an exclamation. It declares that “Strong swearing is an awful thing to do / And worse yet when you swear what isn’t true.” The danger lies especially in false oaths, where the speaker invokes sacred authority while knowingly making an untrue claim. The commandment thus regulates both the content of speech and the intention behind it: an oath is not made harmless by its familiarity, nor made righteous merely because it is emphatic.
The preacher anchors this teaching in Christian scripture. The Lord is said to forbid swearing altogether in the teaching attributed to Matthew, while Jeremiah is invoked to limit legitimate swearing to justice and righteousness. The proper use of an oath must therefore answer to a moral purpose rather than to impulse, vanity, persuasion, or convenience. The commandment is not treated as an ornamental religious maxim but as a rule governing the conditions under which speech may claim divine witness.
The Commandment Within the Divine Law
The Second Commandment is placed within the first table of the laws given by God. The sermon emphasizes that its wording is plain and that its position in the sequence matters: “The second of these laws is very plain” in forbidding the taking of God’s name in vain. The preacher further insists that the Lord forbids such swearing even before homicide and many other cursed sins, following the order of the commandments as a knowledgeable interpreter understands it.
This ordering gives the rule a structural force. False or idle speech is not a minor lapse that can be excused because no body has yet been harmed. The offense attacks the sanctity of the name invoked and corrupts the relation between words, truth, and divine judgment. The sermon consequently presents speech as morally active: a person who swears falsely does not merely describe a falsehood but places sacred authority behind it, converting language into an act of transgression.
Oaths, Promises, and Authority
The commandment also illuminates the many forms of binding speech that appear elsewhere in the narrative. When Theseus addresses Palamon and Arcite, he requires both men to swear that his land will never again be threatened by their hands and that they will not make war against him. This is a political settlement enacted through an oath. Theseus’s authority gives the demand institutional force, while the sworn promise converts defeated enemies into subjects bound by a verbal undertaking. The episode shows how an oath can restrain violence and establish peace, but it also explains why such language must be treated seriously: once sacred or public authority is invoked, a promise is no longer casual conversation.
The same concern appears in the contrast between a genuine command and a report that merely claims to have fulfilled one. A messenger presents the king with his seal and letter and says, “My lord, as you commanded me, / On pain of death, is what I’ve done, no less.” The statement places the messenger’s obedience under the threat of execution, while the seal and letter supply the visible marks of authority. The Second Commandment’s logic makes such a declaration morally perilous if it is false, because the speaker is not only defending himself but presenting his words as accountable to a chain of command and to the truth of the reported action.
Other promises expose the intimate pressure of binding speech. Dorigen tells Aurelius that she will always belong to the man to whom she is joined, then speaks playfully of granting him her love. Her words move between marital fidelity, imaginative concession, and an impossible promise. Elsewhere, a speaker appeals to a woman’s honor, insisting that an action was undertaken “More than to save my life, right here at stake.” These examples show why the commandment matters in courtship and marriage as well as in government: an utterance may be offered as jest, courtesy, self-defense, or devotion, yet still generate obligations or dangers that exceed the speaker’s immediate intention.
Curses, Vengeance, and the Consequences of Speech
The commandment’s reach becomes most dramatic when speech takes the form of a curse. Mabel kneels and calls upon the devil to take both a body and a pan; when the devil hears her curse, he answers her directly. The scene makes the spoken malediction an event with an audible consequence. A curse is not presented as empty sound: it invokes supernatural power, exposes the speaker’s desperation, and opens a relation between the human voice and the power it calls upon.
The sermon’s own warning is equally severe. It states that vengeance upon the house of one who engages in awful swearing will be unsparing. The punishment is therefore figured as extending beyond the isolated utterance and beyond the individual speaker. False or profane speech damages a household and draws judgment into the social world. The doctrine gives the commandment a communal dimension: language can transmit guilt, disorder, and retribution through families and institutions as surely as it can transmit promises or peace.
The sermon closes its appeal by asking God to forgive the trespass of its listeners and to guard them from avarice. That movement from denunciation to petition is significant. The commandment is not merely a weapon for condemning other people; it turns back upon the audience, requiring confession, dependence on divine mercy, and vigilance against the desires that make dishonest speech useful. The prayer for protection places careless swearing beside avarice as a habit that deforms the soul, linking verbal abuse of sacred authority to the wider appetite for gain.
Narrative and Ethical Significance
Across these episodes, the Second Commandment provides a language for reading the difference between what words say and what words do. A royal oath can end a war; a messenger’s assertion can defend or condemn; a playful promise can become an impossible debt; a curse can provoke a supernatural response; and a sermon can transform scattered examples into a general law. The commandment insists that none of these utterances is morally weightless.
Its deepest narrative function is to make truthfulness a matter of action rather than mere accuracy. The crucial questions are whether the speaker is entitled to make the claim, whether the claim serves justice and righteousness, whether sacred authority is being used in vain, and whether the resulting obligation can be fulfilled. The tales repeatedly dramatize the gap between intention and consequence, while the sermon supplies the strictest measure for that gap. Under the Second Commandment, speech becomes a form of conduct, and the misuse of a holy name becomes a breach that can lead to deception, violence, broken loyalty, supernatural danger, and judgment.