Institutio Oratoria

The basis concerned with the letter and the intention of the law involves a legal question as regards the interpretation of the words, which is identical with the question arising out of contrary laws. Consequently some writers have asserted that all these bases may be resolved into those concerned with the letter and intention, while others hold that in all cases where the letter and the intention of a document have to be considered, it is ambiguity that gives rise to the question at issue. But all these bases are really distinct, for an obscure point of law is not the same as an ambiguous point of law. Definition, then,

involves a general question as to the actual nature of a term, a question which may conceivably have no connexion whatsoever with the content of the case in point. In investigations as to the letter and the intention, the dispute turns on the provisions contained in the law, whereas the syllogism deals with that which is not contained in the law. In disputes arising out of ambiguity we are led from the ambiguous phrase to its conflicting meanings, whereas in the case of contrary laws the fight starts from the conflict of their provisions.