Interpretation of law
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The interpretation of laws is necessary (the law does not speak for itself).
The legislator known, and the laws either by writing or by the light of nature sufficiently published, there wanteth yet another very material circumstance to make them obligatory. For it is not the letter, but the intendment, or meaning; that is to say, the authentic interpretation of the law (which is the sense of the legislator), in which the nature of the law consisteth; And therefore the Interpretation of all Lawes dependeth on the Authority Soveraign; and the Interpreters can be none but those, which the Soveraign, (to whom only the Subject oweth obedience) shall appoint.
Hobbes, Lev XXVI 20
Of why laws need interpretation.
All laws, written and unwritten, have need of interpretation. The unwritten law of nature, though it be easy to such as without partiality and passion make use of their natural reason, and therefore leaves the violators thereof without excuse; yet considering there be very few, perhaps none, that in some cases are not blinded by self-love, or some other passion, it is now become of all laws the most obscure, and has consequently the greatest need of able interpreters. The written laws, if laws, if they be short, are easily misinterpreted, for the diverse significations of a word or two; if long, they be more obscure by the diverse significations of many words: in so much as no written law, delivered in few or many words, can be well understood without a perfect understanding of the final causes for which the law was made; the knowledge of which final causes is in the legislator. To him therefore there cannot be any knot in the law insoluble, either by finding out the ends to undo it by, or else by making what ends he will (as Alexander did with his sword in the Gordian knot) by the legislative power; which no other interpreter can do.
Hobbes, Lev XXVI 21