Substance is [...] not a necessary presupposition for linguistic form, but linguistic form is a necessary presupposition for substance. ‘Manifestation’, in other words, is a selection in which the linguistic form is the constant and the substance the variable; we formally define manifestation as a selection between hierarchies and between derivates of different hierarchies.
- Hjelmslev (1961), a pag.106

We shall [...] say that the linguistic usage ‘manifests’ the linguistic schema, and the function between the linguistic schema and the linguistic usage we shall call ‘manifestation’. These terms stand provisionally as operative.
- Hjelmslev (1961), a pag.81