Commentaries on the Laws of England, Book the First

by Sir William Blackstone

[] Locke, Hum. Und. b. 2. c. 21.

Of all the parts of a law the most effectual is the vindicatory. For it is but lost labour to say, "do this, or avoid that," unless we also declare, "this shall be the consequence of your noncompliance." We must therefore observe, that the main strength and force of a law consists in the penalty annexed to it. Herein is to be found the principal obligation of human laws.

Legislators and their laws are said to compel and oblige; not that by any natural violence they so constrain a man, as to render it impossible for him to act otherwise than as they direct, which is the strict sense of obligation: but because, by declaring and exhibiting a penalty against offenders, they bring it to pass that no man can easily choose to transgress the law; since, by reason of the impending correction, compliance is in a high degree preferable to disobedience. And, even where rewards are proposed as well as punishments threatened, the obligation of the law seems chiefly to consist in the penalty: for rewards, in their nature, can only persuade and allure; nothing is compulsory but punishment.

It is held, it is true, and very justly, by the principal of our ethical writers, that human laws are binding upon mens consciences. But if that were the only, or most forcible obligation, the good only would regard the laws, and the bad would set them at defiance. And, true as this principle is, it must still be understood with some restriction. It holds, I apprehend, as to rights; and that, when the law has determined the field to belong to Titius, it is matter of conscience no longer to withhold or to invade it. So also in regard to natural duties, and such offences as are mala in se: here we are bound in conscience, because we are bound by superior laws, before those human laws were in being, to perform the one and abstain from the other. But in relation to those laws which enjoin only positive duties, and forbid only such things as are not mala in se but mala prohibita merely, annexing a penalty to noncompliance, here I apprehend conscience is no farther concerned, than by directing a submission to the penalty, in case of our breach of those laws: for otherwise the multitude of penal laws in a state would not only be looked upon as an impolitic, but would also be a very wicked thing; if every such law were a snare for the conscience of the subject. But in these cases the alternative is offered to every man; "either abstain from this, or submit to such a penalty;" and his conscience will be clear, whichever side of the alternative he thinks proper to embrace. Thus, by the statutes for preserving the game, a penalty is denounced against every unqualified person that kills a hare. Now this prohibitory law does not make the transgression a moral offence: the only obligation in conscience is to submit to the penalty if levied.

I have now gone through the definition laid down of a municipal law; and have shewn that it is "a rule—of civil conduct—prescribed—by the supreme power in a state—commanding what is right, and prohibiting what is wrong:" in the explication of which I have endeavoured to interweave a few useful principles, concerning the nature of civil government, and the obligation of human laws. Before I conclude this section, it may not be amiss to add a few observations concerning the interpretation of laws.

When any doubt arose upon the construction of the Roman laws, the usage was to state the case to the emperor in writing, and take his opinion upon it. This was certainly a bad method of interpretation. To interrogate the legislature to decide particular disputes, is not only endless, but affords great room for partiality and oppression. The answers of the emperor were called his rescripts, and these had in succeeding cases the force of perpetual laws; though they ought to be carefully distinguished, by every rational civilian, from those general constitutions, which had only the nature of things for their guide. The emperor Macrinus, as his historian Capitolinus informs us, had once resolved to abolish these rescripts, and retain only the general edicts; he could not bear that the hasty and crude answers of such princes as Commodus and Caracalla should be reverenced as laws. But Justinian thought otherwise[k], and he has preserved them all. In like manner the canon laws, or decretal epistles of the popes, are all of them rescripts in the strictest sense. Contrary to all true forms of reasoning, they argue from particulars to generals.

[k] Inst. 1. 2. 6.

The fairest and most rational method to interpret the will of the legislator, is by exploring his intentions at the time when the law was made, by signs the most natural and probable. And these signs are either the words, the context, the subject matter, the effects and consequence, or the spirit and reason of the law. Let us take a short view of them all.

1. Words are generally to be understood in their usual and most known signification; not so much regarding the propriety of grammar, as their general and popular use. Thus the law mentioned by Puffendorf[l], which forbad a layman to lay hands on a priest, was adjudged to extend to him, who had hurt a priest with a weapon. Again; terms of art, or technical terms, must be taken according to the acceptation of the learned in each art, trade, and science. So in the act of settlement, where the crown of England is limited "to the princess Sophia, and the heirs of her body, being protestants," it becomes necessary to call in the assistance of lawyers, to ascertain the precise idea of the words "heirs of her body;" which in a legal sense comprize only certain of her lineal descendants. Lastly, where words are clearly repugnant in two laws, the later law takes place of the elder: leges posteriores priores contrarias abrogant is a maxim of universal law, as well as of our own constitutions. And accordingly it was laid down by a law of the twelve tables at Rome, quod populus postremum jussit, id jus ratum esto.

[l] L. of N. and N. 5. 12. 3.