It is one of the aims of linguistics to define itself, to recognise what belongs within its domain. In those cases where it relies upon psychology, it will do so indirectly, remaining independent.
Ferdinand de SaussureThe critical principle demanded an examination, for instance, of the contribution of different periods, thus to some extent embarking on historical linguistics.
Ferdinand de SaussureTime changes all things; there is no reason why language should escape this universal law
Ferdinand de SaussurePsychologically our thought-apart from its expression in words-is only a shapeless and indistinct mass.
Ferdinand de Saussure