What is a word? The copy of a nervous stimulation in sounds. To infer from the fact of the nervous stimulation that there exists a cause outside us is already the result of applying the principle of sufficient reason wrongly. If truth alone had been decisive in the genesis of language, if the viewpoint of certainty had been decisive in creating designations, how could we possibly be permitted to say, ‘The stone is hard’, as if ‘hard’ were something known to us in some other way, and not merely as an entirely subjective stimulus? We divide things up by gender, describing a tree as masculine and a plant as feminine – how arbitrary these translations are! How far they have flown beyond the canon of certainty!
We speak of a snake; the designation captures only its twisting movements and thus could equally well apply to a worm. How arbitrarily these borders are drawn, how one-sided the preference for this or that property of a thing! When different languages are set alongside one another it becomes clear that, where words are concerned, what matters is never truth, never the full and adequate expression; otherwise there would not be so many languages.
The ‘thing-in-itself’ (which would be, precisely, pure truth, truth without consequences) is impossible even for the creator of language to grasp, and indeed this is not at all desirable. He designates only the relations of things to human beings, and in order to express them he avails himself of the boldest metaphors. The stimulation of a nerve is first translated into an image: first metaphor! The image is then imitated by a sound: second metaphor! And each time there is a complete leap from one sphere into the heart of another, new sphere.
~ Friedrich Nietzsche, On Truth and Lying in a Non-Moral Sense