[...] linguistics can and must undertake an analysis of the linguistic form without considering the purport that can be ordered to it in both planes. [...] linguistics must be assigned the special task of describing the linguistic form, in order thereby to make possible a projection of it upon the non-linguistic entities which from the point of view of language provide the substance. Linguistics must then see its main task in establishing a science of the expression and a science of the content on an internal and functional basis […].
- Hjelmslev (1961), Pag. 78-79

Such a linguistics, as distinguished from conventional linguistics, would be one whose science of the expression is not a phonetics and whose science of the content is not a semantics. Such a science would be an algebra of language, operating with unnamed entities, 'i'.'e'., arbitrarily named entities without natural designation, which would receive a motivated designation only on being confronted with the substance.
- Hjelmslev (1961), Pag. 79

While it is the business of linguistics to analyze the linguistic form, it will just as inevitably fall to the lot of other sciences to analyze the purport.
- Hjelmslev (1961), Pag. 77