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 SaussureTime changes all things; there is no reason why language should escape this universal law
Ferdinand de SaussureLinguistics will have to recognise laws operating universally in language, and in a strictly rational manner, separating general phenomena from those restricted to one branch of languages or another.
Ferdinand de Saussure